Speed Calibration - Raymarine ST60 Owner's Handbook Manual

Chapter 4: Calibration
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

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
Speed calibration
the
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
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.
flow chart). Proceed with the speed calibration as follows:
as the measured distance due to errors introduced by tidal flow.
Intermediate calibration
flow chart).
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