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)
• Carry out a calibration run over a measured distance to ensure
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
2. Set the length of the intended calibration run, using either the
3. Press timer and reset keys together to commence the speed
4. Start first outward leg of the calibration run and as you pass the
5. At the end of the outward leg, press the trip key again so that:
or REPEATER (no transducer).
accurate speed readings.
timer and reset keys together to enter adjust mode. In this mode,
the displayed run length flashes on and off.
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.
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.
start point, press the trip key, so the screen shows OUTWARD at
the top. As the calibration run proceeds, the displayed value will
increment.
• 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.
31