Raymarine ST60 Tridata Instrument - Page 48

36 ST60 Tridata Instrument Owner’s Manual
Note: It is recommended that the speed calibration procedure is carried out in conditions
of minimum tidal drift.
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
trip 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
trip 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 trip and reset keys together to commence the speed calibration. The
Cal status screen is displayed. The text at the bottom of the screen alter-
nates between Strt 1 and the calibration factor (CF) currently applied.
4. Start first outward leg of the calibration run and as you pass the start
point, press the
speed key, so that the text out shows at the bottom of the
screen. As the calibration run proceeds, the displayed value will incre-
ment.
5. At the end of the measured distance on the outward leg, press the
speed
key again so that:
• The text rEtrn is flashing at the bottom 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
speed key so the rEtrn legend stops flashing and the displayed value
increments.
7. At the end of the return leg, press the
speed key to end the calibration
run. At this point:
• The text Strt 2 alternating with the new calibration factor is displayed at
the bottom of the screen.
• The displayed distance freezes. This value should be very close to the
actual (measured) distance of the calibration run.
8. Press the
depth and speed keys together, to store the new calibration
factor.
81040_5.book Page 36 Monday, February 20, 2006 2:39 PM