Raymarine St290 Specifications Page 183

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7-2-26 Section 7: System Setup
ST290 Instrument System Owners Handbook
Start calibration
To calibrate the Speed transducer:
1. Use the or button to highlight the CAL.POINTS value field (as in
Figure 2-24 ). This value defines the number of different speeds you
want to use for speed calibration.
2. Press the button for 1 second to enter edit mode. The CAL.POINTS
value field flashes, to indicate you can change the value.
3. Use the or button to set the required number of different speeds
for speed calibration.
4. Hold down the button for 1 second to save the setting.
5. Use the or button to highlight the calibration factor value field
for the first calibration speed.
6. Apply the correct calibration factor by using either the Set to SOG or
Manual calibration procedure, as required.
Set to SOG
To use SOG to determine the correct calibration factor (and therefore
speed):
1. Carry out the Start calibration procedure (above).
2. In conditions of zero tide and zero current, run your vessel at approx-
imately the calibration speed, using the SOG reading as a guide.
3. Press the button,to apply the value of SOG as the indicated SPEED.
The highlighted calibration factor value changes as appropriate.
4. Use the or button to highlight the calibration factor value field
for the next calibration speed.
5. Repeat Set to SOG steps 2 to 4, until all calibration factor values are
correct.
Manual calibration
To manually apply the correct calibration factor:
1. Carry out the Start calibration procedure (above).
2. In conditions of zero tide and zero current, run your vessel at a steady
speed approximately that of the highlighted calibration speed, over a
measured distance.When you do this, make a note of:
The speed indicated by the instrument.
The time it takes to cover the measured distance.
81183_2 S7.book Page 26 Wednesday, May 7, 2003 1:52 PM
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