Raymarine ST60 Tridata Owner's Handbook Manual - Speed Calibration
Chapter 4: Calibration
31
Intermediate calibration enables you to:
• Check the instrument software version.
• Check the instrument status - either MASTER (transducer connected) or
REPEATER (no transducer).
• Carry out a calibration run over a measured distance to ensure accurate speed
readings.
To start Intermediate calibration, hold down the
speed
and
trip
keys for
approximately 4 seconds (see
Intermediate calibration
flow chart).
Speed calibration
The speed calibration procedure involves carrying out two runs over a measured
distance, to enable a calibration factor to be determined and applied to your ST60
Speed instrument, to ensure optimum accuracy. Each calibration run comprises
outward and return legs, to minimise the affect of tidal drift when the calibration
factor is determined.
To carry out a speed calibration, start the Intermediate calibration procedure and
use the
speed
key to proceed to the Calibration run length screen (see
sheet 1
of
the
Speed calibration
flow chart). Proceed with the speed calibration as follows:
1. With the Calibration Run Length screen displayed, press the
timer
and
reset
keys together to enter adjust mode. In this mode, the displayed run length
flashes on and off.
2. Set the length of the intended calibration run, using either the
timer
key to
decrement or the
reset
key to increment the run length value. You can set any
value between 0.25 and 2.50.
3. Press
timer
and
reset
keys together to commence the speed calibration. The
Cal status screen is displayed. The text at the top of the screen alternates
between START 1 and the calibration factor currently applied.
4. Start the outward leg of the calibration run and as you pass the start point,
press the
trip
key, so the screen shows OUTWARD at the top. As the calibra-
tion run proceeds, the displayed value will increment.
5. At the end of the outward leg, press the
trip
key again so that:
• The text RETURN is flashing at the top of the screen.
• The displayed distance freezes. Note that this value will not be the same
as the measured distance due to errors introduced by tidal flow.
6. Turn the vessel round, start the return leg and as you do so, press the
trip
key
so RETURN stops flashing and the displayed value increments.