User manual RAYMARINE ST40 BIDATA

Distributed by Any reference to Raytheon or RTN in this manual should be interpreted as Raymarine. The names Raytheon and RTN are owned by the Raytheon Company. ST40 Bidata Instrument Owner's Handbook Document number: 81159_2 Date: 1st May 2001 Copyright © Raymarine Limited 2001 Preface i Important information WARNING Although your ST40 instrument is designed to give accurate and reliable performance, it should serve only as an aid to navigation and should never lead to the erosion of good seamanship. Always maintain a permanent watch and be aware of situations as they develop. EMC conformance All Raymarine equipment and accessories are designed to the best industry standards for use in the leisure marine environment. The design and manufacture of Raymarine equipment and accessories conform to the appropriate Electromagnetic Compatibility (EMC) standards, but correct installation is required to ensure that performance is not compromised. Handbook information To the best of our knowledge, the information in this handbook was correct when it went to press. However, the Raymarine policy of continuous product improvement may change product specifications without notice. Consequently, unavoidable differences may occur between the product and the handbook from time to time, for which Raymarine cannot accept liability. ii ST40 Bidata Instrument Owner's Handbook Preface iii Contents Important information .......................................................... i WARNING ......................................................................... i EMC conformance ............................................................. i Handbook information ....................................................... i Preface ..................................................................................... v Parts supplied ................................................................... vi Chapter 1: Operation ............................................................. 1 1.1 Introduction ................................................................. 1 Display ....................................................................... 1 1.2 Operating procedures .................................................. 2 Display action ............................................................. 2 Silencing alarms ......................................................... 2 1.3 Alarms ......................................................................... 7 Alarm indications ....................................................... 7 Shallow alarm ........................................................ 7 Deep alarm ............................................................. 7 Anchor alarms ........................................................ 7 Enabling/disabling alarms .......................................... 8 Chapter 2: Maintenance and Fault Finding ........................ 9 2.1 Maintenance ................................................................ 9 Servicing and safety ................................................... 9 Instrument ................................................................... 9 Transducer ................................................................ 10 Cabling ..................................................................... 10 2.2 Fault finding .............................................................. 10 Preliminary procedures ............................................ 10 Fixing faults .............................................................. 10 Assistance ................................................................. 13 iv ST40 Bidata Instrument Owner's Handbook Chapter 3: Installation ......................................................... 15 3.1 Planning your installation ......................................... 15 EMC installation guidelines ..................................... 15 Suppression Ferrites ........................................... 16 Connections to Other Equipment ......................... 16 Tools required .......................................................... 16 Site requirements ...................................................... 17 Transducers .......................................................... 17 Instrument ............................................................ 19 3.2 Procedures ................................................................. 20 Fitting transducers .................................................... 20 Running transducer cable .................................... 20 Connections to the instrument .................................. 21 Stand-alone connections ...................................... 22 SeaTalk connections ............................................ 23 Fitting the instrument ............................................... 23 Desktop Mounting Bracket .................................. 25 3.3 Calibration requirement ............................................ 26 Chapter 4: Calibration ......................................................... 27 4.1 Introduction ............................................................... 27 EMC conformance ................................................... 27 4.2 User calibration ......................................................... 27 Depth offsets ............................................................ 31 4.3 Intermediate calibration ............................................ 31 4.4 Dealer calibration ...................................................... 32 Instrument Specification .................................................... 35 Glossary ................................................................................. 37 Index ...................................................................................... 39 Preface v Preface Thank you for purchasing a Raymarine product. We are sure your ST40 instrument will give you many years of trouble-free operation. This instrument is designed to provide reliable performance, even under the most demanding conditions. D48 07-2 vi ST40 Bidata Instrument Owner's Handbook Parts supplied ST40 BIDATA ST40 Bidata instrument Instrument Cover Gasket Retractable speed transducer Supplied with bung (not illustrated) Depth transducer Clamping bracket 1 m (3 ft) power cable Fixing stud Thumb nut ST40 Bidata Instrument - quick reference guide Normal operation SWITCH ON SPEED Last permanent screen is displayed DEPTH Depth Notes: * denotes temporary screens which will time-out to the previous permanent screen after 5 seconds. On repeater instruments, on;ly the Speed, Water temperature, Depth and Minimum depth screens are available. Alarm on/off Shallow alarm 3 seconds ST40 Bidata Instrument Owner's Handbook Worldwide Distributors Current speed Minimum depth Maximum speed Reset 3 seconds Average speed Reset 3 seconds Deep alarm Alarm on/off 3 seconds + Alarm on/off Set alarm level - Log Shallow anchor alarm Reset 3 seconds Alarm on/off Deep anchor alarm 3 seconds Trip 3 seconds Water Temp. Offset With Set alarm level screen displayed, press the and keys simultaneously to save the alarm level and return to normal operation. Adjusting display backlighting/contrast To enter adjust mode, press OFF for 1 second to adjust BACKLIGHTING and a further 1 second to adjust CONTRAST LEVEL 2 or LEVEL 3 LEVEL 2 LEVEL 1 LEVEL 1 To exit adjust mode press or wait for 5 second timeout Owner's Handbook. Warranty document and fitting templates included in Handbook Worldwide Service Centre Handbook. Quick Reference Guide Note: The items shown here are supplied for an ST40 Bidata system. If an instrument is purchased separately, transducers are not included. If any item is not present, contact your Raymarine Dealer. D4730-2 Chapter 1: Operation 1 Chapter 1: Operation 1.1 Introduction Your ST40 Bidata instrument: · Provides speed information (current, maximum and average), in either knots (KTS), miles per hour (MPH) or kilometres per hour (KPH). · Provides log and trip information. These are given in either nautical miles (NM), statute miles (M) or kilometres (KM). · Provides water temperature information. This is given in either degrees Celsius (°C) or degrees Fahrenheit (°F). · Provides depth information in either feet (FT), metres (M) or fathoms (FA). · Records the minimum depth encountered during the period it is switched on. You can reset this at any time. · Enables you to define alarm thresholds for shallow water, deep water, shallow anchor and deep anchor. · Enables you to see what offset is applied to the depth reading. Note: The required speed, distance, depth and water temperature units are selected during User calibration (see Chapter 4, Calibration). CAUTION Your instrument is calibrated to factory (default) settings when first supplied and must therefore be calibrated before use, to ensure optimum performance on your vessel. Do NOT use the instrument until the calibration procedures have been satisfactorily completed, using the procedures in Chapter 4, Calibration. Coloured bezel and Desktop Mounting Bracket options are available for your ST40 instrument. Contact your Raymarine dealer for further information. Display The ST40 Bidata display comprises upper and lower data areas, each of which shows either depth or speed information, selected as shown in the following illustration. 2 ST40 Bidata Instrument Owner's Handbook DEPTH SPEED SPEED DEPTH Selecting where speed and depth information is displayed D4733-2 1.2 Operating procedures Operating information is presented in flow chart form. The flow charts show the various operating screens and key presses necessary to carry out the various instrument functions. Key presses are momentary unless otherwise stated. Note that: · Up/down depth-trend arrows are displayed, if the seabed is rising or falling at a significant rate. · The minimum depth reading is reset to zero at power up. · The maximum speed reading is reset to zero at power up. · The average speed reading is reset to zero at power up. · The Log screen shows the total distance covered by the vessel since the ST40 Bidata instrument was fitted. · The trip reading is reset to zero at power up. Display action During normal operation (see Normal operation flow charts), the Speed, Depth and Water temperature screens are permanent screens, i.e. once one of these is selected, it will remain until another screen is manually selected. All other screens are temporary and after 5 seconds, will time out to the permanent screen which was last displayed for 5 seconds or more. Silencing alarms To silence an alarm (see the Alarms section, later in this chapter), momentarily press any one of the instrument keys. Chapter 1: Operation 3 NORMAL OPERATION (sheet 1) Switch on DEPTH SPEED SPEED Previous speed screen is displayed Current speed Water temperature DEPTH See NORMAL OPERATION (sheet 2) Maximum speed To reset 3 seconds Trip To reset 3 seconds Note: The trip distance can be reset only if the instrument is a speed master, i.e. connected to a speed transducer. Log Average speed To reset 3 seconds Note: Screens annotated with * are temporary and will time-out to the previous permanent screen after 5 seconds. D4731-2 4 ST40 Bidata Instrument Owner's Handbook NORMAL OPERATION (sheet 2) Switch on SPEED DEPTH DEPTH Depth SPEED See NORMAL OPERATION (sheet 1) To/from Offset screen (sheet 3) Minimum depth To reset 3 seconds Notes: Note: Screens other than the Depth screen, are temporary and will time-out to the previous permanent screen after 5 seconds. This diagram shows the operating sequence for an ST40 Bidata master instrument. On a repeater instrument, only the Depth, Minimum depth, Speed and Water temperature screens are available. With any set alarm screen displayed, press the and keys simultaneously to save the alarm level and return to normal operation. Shallow alarm Alarm on/off Set Shallow alarm 3 seconds Increase + Momentary If the Shallow alarm has been locked during User calibration, you cannot switch it on or off or change the threshold value. To/from Deep alarm screen (sheet 3) Decrease D4732-2 Chapter 1: Operation 5 NORMAL OPERATION (sheet 3) To/from Shallow alarm screen (sheet 2) Alarm on/off 3 seconds Set Deep alarm Increase Deep alarm + Momentary Decrease Alarm on/off 3 seconds Set Shallow anchor alarm Increase Shallow anchor alarm + Momentary Decrease Alarm on/off 3 seconds Set Deep anchor alarm Increase Deep anchor alarm + Momentary Decrease Offset (+ve values) (offset = 0.0) (-ve values) To/from Depth screen (sheet 2) Note: Screens other than the Depth screen, are temporary and will time-out to the previous permanent screen after 5 seconds. D4734-2 6 ST40 Bidata Instrument Owner's Handbook Adjusting display backlighting and contrast Hold down for 1 second to enter Adjust Backlight mode for 2 seconds to move through Adjust Backlight mode and enter Adjust Contrast mode ADJUST BACKLIGHTING During normal operation, press for 1 second The current backlighting level is displayed. Select the required backlighting level then: to adjust contrast, press for 1 second to return to normal operation, or press or wait for 5 second timeout Normal operation ADJUST CONTRAST During normal operation, press for 2 seconds via Adjust Backlighting The current contrast level is displayed. Select the required contrast level then press or or wait for 5 second timeout Normal operation D4845-1 Chapter 1: Operation 7 1.3 Alarms Alarm indications Shallow alarm Depth is equal to or less than the shallow alarm threshold. Alarm continues until cancelled manually. D4666-2 Deep alarm Triggered by depths equal to the deep alarm threshold. Continues until cancelled manually. D4789_2 Anchor alarms Depth is either: equal to or less than the shallow anchor alarm threshold or equal to or more than the deep anchor alarm threshold D4790-2 8 ST40 Bidata Instrument Owner's Handbook Enabling/disabling alarms You can enable or disable any alarm function (i.e. switch it on or off ) by selecting the relevant alarm screen (see Normal operation) and holding down the key for 3 seconds (toggle action). Chapter 2: Maintenance and Fault Finding 9 Chapter 2: Maintenance and Fault Finding 2.1 Maintenance Servicing and safety · Raymarine equipment should be serviced only by authorised Raymarine service technicians. They will ensure that service procedures and replacement parts used will not affect performance. There are no user-serviceable parts in any Raymarine product. · Some products generate high voltages, so never handle the cables/ connectors when power is being supplied to the equipment. · When powered up, all electrical equipment produces electromagnetic fields. These can cause adjacent pieces of electrical equipment to interact with one another, with a consequent adverse affect on operation. In order to minimise these effects and enable you to get the best possible performance from your Raymarine equipment, guidelines are given in the installation instructions, to enable you to ensure minimum interaction between different items of equipment, i.e. ensure optimum Electromagnetic Compatibility (EMC). · Always report any EMC-related problem to your nearest Raymarine dealer. We will use any such information to improve our quality standards. · In some installations, it may not be possible to prevent the equipment from being affected by external influences. In general this will not damage the equipment but it can lead to spurious resetting action, or momentarily may result in faulty operation. · Always switch off the power to Raymarine equipment before working on it. When requesting service, please quote equipment Type, Model Number, Serial Number and, if possible, Software Release Issue. The Software Release Issue can be ascertained by means of the Intermediate Calibration facility, see Chapter 4, Calibration. Instrument Certain atmospheric conditions may cause a small amount of condensation to form on the instrument window. This will not harm the instrument and will clear after the instrument has been switched on for a short period. 10 ST40 Bidata Instrument Owner's Handbook Periodically clean your ST40 instrument with a soft damp cloth. Do NOT use chemical or abrasive materials to clean the instrument. Transducers Refer to the Installation and Maintenance instructions supplied with the transducers. Cabling Examine all cables for chafing or other damage to the outer shield and, where necessary, replace and re-secure. 2.2 Fault finding Preliminary procedures If you appear to have a problem, first check the security of the connections at the rear of the instrument and reconnect any that are loose. Changes in the electronic environment may adversely affect the operation of your ST40 equipment. Typical examples of such changes are: · Electrical equipment has recently been installed or moved aboard your vessel. · You are in the vicinity of another vessel or shore station emitting radio signals. Fixing faults All Raymarine products are subjected to comprehensive test and quality assurance programmes prior to packing and shipping. However, if a fault occurs, the following guidelines may help to identify and rectify the problem. Low battery Action Recharge your vessel's battery as soon as possible BIDATA D4737-2 Chapter 2: Maintenance and Fault Finding 11 Display blank Action Check fuse/circuit breaker. Check power supply. ST40 BIDATA D4738-2 Check SeaTalk cabling and connector security. Depth reading flashes when under way ST40 BIDATA OR ST40 BIDATA D4739-2 Action Ensure that reading stabilises when clear of disturbed water, e.g. boat wakes, propeller wash etc. No depth information OR ST40 BIDATA ST40 BIDATA 1 minute 1 minute ST40 BIDATA ST40 BIDATA D4740-2 Action Check the condition of the depth transducer cable and the security of the connections. Could also be due to weed growing on the transducer face. 12 ST40 Bidata Instrument Owner's Handbook No speed or temperature information ST40 BIDATA OR ST40 BIDATA and and ST40 BIDATA ST40 BIDATA D4741-3 Action Check the condition of the speed transducer cable and the security of the connections. No speed information but temperature information is present OR ST40 BIDATA ST40 BIDATA and and ST40 BIDATA ST40 BIDATA D4742-2 Action CAUTION If you need to remove the transducer insert, have the transducer bung to hand and secure it in the transducer body immediately after the insert has been removed, to prevent excessive ingress of water. The speed transducer paddle wheel may be fouled. Clean the paddle wheel. Chapter 2: Maintenance and Fault Finding 13 SeaTalk information not being transferred between instruments For example, backlighting level changes implemented at one instrument do not affect other instruments Action Check security of SeaTalk connections between instruments. Check condition of SeaTalk cables. Isolate faulty instrument by disconnecting instruments one by one. A group of SeaTalk instruments not working Action ST40 WIND Check the security of SeaTalk connectors between functioning and non-functioning instruments. ST40 DEPTH ST40 BIDATA D4747-2 Assistance If you are unable to rectify any problem, please contact your local Raymarine Dealer for assistance. 14 ST40 Bidata Instrument Owner's Handbook Chapter 3: Installation 15 Chapter 3: Installation This chapter describes how to install the ST40 Bidata instrument, and associated transducers. The transducers are fitted in the hull of the vessel and is connected to the rear of the instrument. 3.1 Planning your installation Determine the best positions for both transducer and instrument, such that the EMC installation guidelines and the Site requirements (below) are satisfied. EMC installation guidelines All Raymarine equipment and accessories are designed to the best industry standards for use in the leisure marine environment. Their design and manufacture conform to the appropriate Electromagnetic Compatibility (EMC) standards, but correct installation is required to ensure that performance is not compromised. Although every effort has been taken to ensure that they will perform under all conditions, it is important to understand what factors could affect the operation of the product. The guidelines given here describe the conditions for optimum EMC performance, but it is recognised that it may not be possible to meet all of these conditions in all situations. To ensure the best possible conditions for EMC performance within the constraints imposed by any location, always ensure the maximum separation possible between different items of electrical equipment. For optimum EMC performance, it is recommended that wherever possible: · All Raymarine equipment and cables connected to it are: · At least 1 m (3 feet) from any equipment transmitting or cables carrying radio signals e.g. VHF radios, cables and antennas. In the case of SSB radios, the distance should be increased to 2 m (7 ft). · More than 2 m (7 ft) from the path of a radar beam. A radar beam can normally be assumed to spread 20 degrees above and below the radiating element. 16 ST40 Bidata Instrument Owner's Handbook · The equipment is supplied from a different battery from that used for engine start. Voltage drops below 10 V in the power supply to our products, and starter motor transients, can cause the equipment to reset. This will not damage the equipment, but may cause the loss of some information and may change the operating mode. · Raymarine specified cables are used at all times. Cutting and rejoining these cables can compromise EMC performance and so must be avoided unless doing so is detailed in the installation manual. · If a suppression ferrite is attached to a cable, this ferrite should not be removed. If the ferrite needs to be removed during installation it must be reassembled in the same position. Suppression Ferrites The following illustration shows typical cable suppression ferrites fitted to Raymarine equipment. Always use the ferrites supplied by Raymarine. D3548-2 Connections to Other Equipment If your Raymarine equipment is going to be connected to other equipment using a cable not supplied by Raymarine, a suppression ferrite MUST always be fitted to the cable close to the Raymarine unit. Tools required The tools required for fitting the standard ST40 instrument system are shown in the following illustration. Chapter 3: Installation 17 57 mm (2.25 in) 51 mm (2.0 in) D4643-1 Note: If you intend fitting a nonstandard transducer, extra tools may be required Site requirements Transducers The transducer types required for the various hull types are as follows: Hull material GRP Steel Aluminium Wood Speed transducer M78712 Through hull plastic (supplied as standard) M78716 Through hull bronze Depth transducer M78713 through hull plastic (supplied as standard) or M78718 Retractable through hull M78714 Through hull bronze 75 mm (2.94 in) diameter 75 mm (2.94 in) diameter 89 mm (3.50 in) Depth Speed 51 mm (2.0 in) diameter 75 mm (2.94 in) 5 mm diameter (0.19 in) 51 mm (2.0 in) diameter 75 mm (2.94 in) diameter 14 mm (0.57 in) Plastic through hull transducer dimensions D4447-2 100 mm (3.95 in) 18 ST40 Bidata Instrument Owner's Handbook Other transducer types are available for specific requirements. For further details, contact your local Raymarine dealer. The transducers should be sited within the clear water flow areas indicated by the shaded areas below. Sailing vessel Planing power vessel Displacement power vessel Transducer siting D4349-1 Each transducer should also: · Be ahead of the propellers (by a minimum of 10% of the water line length ). · Be at least 150 mm (6 in) away from the keel (ideally ahead of the keel if a sailing yacht). · Be as near as possible to the centre line of the vessel. · Be clear of other through-hull fittings or projections. · Have sufficient clearance inside the hull to fit the nut. · Have 100 mm (4 in) of headroom to allow for withdrawal. In addition to the above requirements, the depth transducer must be mounted within 100 of the vertical, forward, aft and athwart ships. Chapter 3: Installation 19 Depth transducer maximum angle D4350-2 Instrument 55 mm (2.2 in) ST40 70 mm (2.8 in) 126 mm (5.0 in) 21 mm (0.8 in) 30 mm (1.2 in) minimum cable clearance 17 mm (0.67 in) Instrument dimensions D4644-2 CAUTION: The presence of moisture at the rear of the instrument could cause damage either by entering the instrument through the breathing hole or by coming into contact with the electrical connectors. Each instrument must be positioned where: · It is easily read by the helmsman or navigator · It is protected against physical damage · It is at least 230 mm (9 in) from a compass · There is reasonable rear access for installation and servicing · The rear of the instrument is protected from water. 20 ST40 Bidata Instrument Owner's Handbook 3.2 Procedures Adapt these procedures as appropriate, to suit your individual requirement. CAUTION: Where it is necessary to cut holes (e.g. for cable routing and instrument mounting), ensure that these will not cause a hazard by weakening critical parts of the vessel's structure. If in doubt, seek the advice of a reputable boat builder. Fitting transducers Instructions for installing and maintaining the speed and depth transducers are packed with them. Before attempting to install the transducers, read these instructions and the Site requirements for transducers described in this Chapter. Running transducer cable Each transducer type has a 9 m (30 ft) cable fitted with spade terminals for connection to the ST40 Bidata instrument. Observing the following guidelines, run the cable to the instrument: · If the cable has to be fed through the deck, always use a good quality deck gland. · Where cables are fed through holes, always use grommets to prevent chafing. · Secure long cable runs so they do not present a hazard. · Wherever possible, route the cable away from fluorescent lights, engines, radio transmitting equipment, as these may cause interference. Important point: Do NOT shorten the cable from the depth transducer as this will seriously degrade transducer performance. Chapter 3: Installation 21 Connections to the instrument You can connect your instrument: · Directly to the speed and depth transducers as a stand-alone master instrument. When connected in this manner, the instrument must be connected to a suitable power source using the 1 m (3 ft) power cable provided. · As part of a SeaTalk system either as a repeater or, with a transducer also connected as a system master. To connect to SeaTalk, you will need an additional SeaTalk Interconnection Kit (Part No. E25028). When connected in this manner, power can be provided from the SeaTalk bus (e.g. from the autopilot). You can also connect the instrument to the speed and depth transducers and to SeaTalk. When thus connected, the instrument will be the master speed and depth instrument for the SeaTalk system. If it is necessary to fit spade connectors to the transducer cable, do so as shown in the following illustration. Prepare the cable, as at (a), and fit the spade connectors, as at (b). When fitting each spade connector, ensure that wire strands do not extend beyond the rear of the spade connector insulation. 50 mm 10 mm (a) 4 mm (b) Preparing wires for connection 3 mm D4467-3 22 ST40 Bidata Instrument Owner's Handbook Stand-alone connections CAUTION Ensure that the power supply for each stand-alone ST40 instrument is protected by a 3 A fuse or circuit breaker. 3 A circuit breaker Red +ve Uninsulated wire (screen) -ve 12 V dc supply (e.g. battery) _ + Note: A 3 A fuse can be used in place of the circuit breaker, if preferred. Power cable Screen Blue Black Cable from Depth transducer Red Green Screen White Brown Cable from Speed transducer D4791-2 Connections to a stand-alone instrument Chapter 3: Installation 23 SeaTalk connections CAUTION When instruments are connected to SeaTalk, ensure that the power supply for the SeaTalk 12 V line is protected by a 5 A fuse or circuit breaker. 5 A circuit breaker Red (+ve) Uninsulated wire (screen) -ve Note: A 5 A fuse can be used in place of the circuit breaker, if preferred. 12 V dc supply (e.g. course computer or battery) Power cable SeaTalk bus SeaTalk bus Typical SeaTalk connections SeaTalk interface kit D4825-2 Fitting the instrument Fit your ST40 instrument as shown in the following illustrations. 1 Remove template from handbook (immediately after index), apply to required location and mark cutting centre. ST4 0 In stru me nt Tem pla te TOP sha Cut ded out are ao nly Cutting centre Cut 57 out h diamm (2ole me .25 ter in ) D4759-1 24 ST40 Bidata Instrument Owner's Handbook 2 Cut hole 57 mm (2.25 in) cutter D4760-1 3 Peel protective sheets from gasket D4770-1 4 Stick gasket to rear of instrument D4761-1 Chapter 3: Installation 25 5 Screw stud into instrument D4819-1 6 Feed cables through clamping bracket, connect cables then secure instrument with bracket and thumb nut D4762-1 Desktop Mounting Bracket An optional Desktop Mounting Bracket (Part No. E25024) enables you to mount your ST40 instrument in locations where other forms of mounting are impractical. 26 ST40 Bidata Instrument Owner's Handbook D4646-1 To bracket mount your ST40 instrument, do so in accordance with the Instruction Sheet, which is included with the Desktop Mounting Bracket. 3.3 Calibration requirement Once installation is complete and before you use your instrument, carry out the calibration procedures detailed in Chapter 4, Calibration. Chapter 4: Calibration 27 Chapter 4: Calibration 4.1 Introduction The procedures in this Chapter must be carried out before the equipment is used operationally, to optimise the performance of the instrument with the vessel. Calibration information is presented in flow chart form. The flow charts show the various calibration screens and key presses necessary to carry out calibration. All key presses are momentary unless otherwise stated. EMC conformance · Always check the installation before going to sea to make sure that it is not affected by radio transmissions, engine starting etc. 4.2 User calibration User calibration enables you to: · Set the required units for speed readings. Either KTS (knots), MPH (miles per hour) or KPH (kilometres per hour). · Select temperature units. Either °C or °F, as required. · Set the speed display response. Use higher response values when boating in conditions requiring rapid updates of the current speed (e.g. competition sailing or on power boats). Use slower response values when you require an average speed over a longer period of time (e.g. when cruising, especially in heavy seas). · Set the correct speed reading, either by using a Cal factor screen to adjust the calibration factor, or by applying Speed Over Ground (SOG) as the current speed. Your vessel must be moving at 0.5 KTS or more and be receiving SeaTalk SOG data, to enable SOG to be applied as the current speed. This should be done only in conditions of zero tide and current. · Set the depth display response. Use higher response values when boating in conditions requiring rapid updates of depth information (e.g. inshore, especially when travelling at high speed). Use slower response values when you require an average depth over a longer period of time (e.g. deep sea cruising). · Set the required units for depth readings. Either FT (feet), M (metres) or FA (fathoms). 28 ST40 Bidata Instrument Owner's Handbook · Set the required depth offset. · Lock the shallow alarm, to prevent unauthorised changes during normal operation. Power up the instrument then follow the procedure in the User calibration flow diagram. This diagram shows the User calibration sequence for an ST40 Bidata operating as a master instrument for both speed and depth . Chapter 4: Calibration 29 USER CALIBRATION (sheet 1) During normal operation hold down Entry screen Note: If there is no key activity when the Entry screen is displayed, calibration will time out to normal operation after 5 seconds, ST40 BIDATA and for approximately 2 seconds From Shallow alarm lock screen (sheet 2) Depth response CAL 15 (fast) ST40 BIDATA 1 (slow) Speed response CAL 15 (fast) ST40 BIDATA 1 (slow) Depth units CAL FA ST40 BIDATA M Speed units CAL