Raymarine ST70 Instrument, Installation Manual

Page: 57 / 73

Chapter 3: Commissioning Procedures 47
Alignment
To carry out the wind vane alignment:
1. With the
Wind transducer setup menu
displayed, scroll to Align Vane , then press
OK
to
display the Align Vane screen
2. Sail the boat directly into the wind, then press
OK
to accept the alignment and return to the
Wind transducer setup menu.
Note:
On a calm day, motor fast enough to create ‘your
own wind’.
If there is any inaccuracy after you have completed the wind vane alignment, then:
1. At the
Wind transducer setup menu, select
Vane Adjust , to display the Vane Adjust screen.
2. Sail the boat directly into the wind, then scroll to
manually set the wind reading to zero.
3. Press
OK
to accept the value and return to the
Wind transducer setup menu.
4. Press
CANCEL
to return to the Transducers
found menu.
Calibrate wind speed
To set the correct apparent wind speed reading:
1. With the
Wind transducer setup menu
displayed, scroll to Calibrate AWS , then press
OK
to display the Calibrate AWS screen.
2. Scroll to adjust the Calibration Factor so that the
AWS value in the information box is set to the
correct value.
3. Press
OK
to accept the value and return to the
Wind transducer setup menu.
4. Press
CANCEL
to return to the Transducers
found menu.
Speed calibration
The object of speed calibration is to ensure that the speed readings at the ST70+
Instruments are true indications of the boat speed, ideally over the speed range of the
vessel, i.e. from stationary to top speed.
In order to take into account the changes in water-flow characteristics across the hull,
for different speeds, it is advisable carry out speed calibration at as many speeds as
possible, over the speed range of the vessel.
This is particularly important for
planing vessels .
Conventional Speed transducers have a maximum of five calibration speeds, and
smart transducers (DST800) have up to eight. The correct calibration at each speed
is achieved by applying a calibration factor to the indicated speed reading.
In order to achieve accurate results, speed calibration must be carried out in
conditions of
zero tide and zero current .
i
D1
1227-1 Press OK to accept
Align Vane
Now align the wind vane. Steer your
boat directly into the wind, then press OK.
26°
i
D1
1228-1
Press OK to accept
Vane Adjust
Manually adjust your vane.
206°
i
D1
1229
-1
See Docs for Manual Calibration.
Press OK to accept
Calibrate
AWS: 3.2 KTS
0.73
Calibration factor
AWS value
87099_1.book Page 47 Thursday, March 12, 2009 10:18 AM