Raymarine ST70+ Installation Manual page 59

Chapter 3: Commissioning Procedures
Set to SOG
To use SOG to set the correct speed:
1. Carry out the Starting speed calibration procedure (above).
PAGE DN
2. Press
3. In conditions of zero tide and zero
current, run your vessel at
approximately the selected
calibration speed, using the SOG
reading as a guide.
4. Scroll to adjust the calibration factor,
so the current speed value changes
to be the same as SOG
PAGE UP
5. Press
calibration speed field.
6. Scroll to select the next calibration
speed.
7. Repeat Set to SOG steps 2 to 6, until calibration factor values have been set for all
calibration speeds.
OK
8. Press
CANCEL
9. Press
Manual speed calibration
You only need to carry out a manual
speed calibration if SOG data is not
available. If you have successfully
calibrated your system using SOG data,
ignore this manual procedure.
To manually calibrate a conventional
speed transducer:
1. Using the appropriate start speed cal-
ibration procedure (above), display
the speed Calibration screen and
select the calibration speed field.
2. In conditions of zero tide and zero current, run your vessel at a steady speed
approximately that of the selected calibration speed, over a measured dis-
tance.When you do this, make a note of:
• The current speed value.
• The time it takes to cover the measured distance.
3. Calculate the actual speed over the measured distance (distance/time).
to highlight the calibration factor field.
to highlight the
to save the values and return to the Speed transducer setup menu.
to return to the Transducers found menu.
Calibration
Current
SOG
value
SOG = 0.9
i
Speed = 1.2
Current
Press OK to accept
speed
value
Calibration
See Documentation for Manual Calibrarion
i
Speed = 1.2 KTS
Current
Press OK to accept
speed
value
49
Calibration speed
2.0 KTS
1.8
Calibration factor
Calibration speed
2.0 KTS
1.8
Calibration factor