Set To Sog; Manual Speed Calibration - Raymarine ST70+ Operating Manual

42

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 cali-
bration 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.
ST70+ User Reference Manual
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
Calibration speed
2.0 KTS
1.8
Calibration factor
Calibration speed
2.0 KTS
1.8
Calibration factor