Raymarine ST70 Instrument, Installation Manual

Page: 53 / 73

Chapter 3: Commissioning Procedures 43
2. When calibration is complete, a message will be displayed showing the detected
deviation. If deviation is more than 5 degrees:
i.
Stop the calibration process
ii. Re-site the compass away from metal items
iii. Repeat the calibration process.
If deviation remains at more than 5 degrees, contact your Raymarine dealer for
advice.
If the deviation figure exceeds 15° or the display shows no deviation value, the
compass is being affected by ferrous objects on your boat. Move the compass to
a better location. Higher deviation figures are acceptable on steel boats.
3. If the deviation is within acceptable limits, press
OK
to continue calibration:
• If GPS data is available on the system, the Align to GPS screen is displayed.
Carry out the Aligning the compass to GPS procedure.
• If your system does not have a GPS, the Compass Offset screen is displayed.
Carry out the Aligning the compass manually procedure.
Aligning the compass to GPS
If a GPS is connected to your data network
(SeaTalk, SeaTalk
ng
or NMEA), the autopilot is set
to the GPS heading while you steer to a known
magnetic heading. This step provides a rough
alignment to reduce the amount of subsequent
adjustment required.
If GPS data is available, align the compass as
follows:
1. Steer the boat on steady course and travel
above 3 knots.
2. Follow the on-screen instructions until the screen displays the ‘ OK ’ message, then
press
OK
to continue to the AutoLearn entry page.
Aligning the compass manually
If GPS data is not available, carry out a manual
compass alignment as follows:
1. Steer on a steady course and scroll, to adjust
the displayed heading offset in the upper edit
box, until the actual heading in the lower box
matches the ship’s compass reading.
Note:
There may be a slight delay between the adjustment of
the heading offset and the change in the value of the ac-
tual heading.
2. When the actual heading value has stabilized, press
OK
to continue to the
AutoLearn entry page.
i
D1
1
192-1
Press OK to continue
Align to GPS
OK
Steer the boat on a steady course.
Press CANCEL to exit.
N
S
W E
N
W E
i
D1
1202-1
Press OK to accept
Compass Offset
N
S
W E
N
W E
Use +1 and -1 buttons or rotary to
adjust the heading.
6°
240°
Heading M
87099_1.book Page 43 Thursday, March 12, 2009 10:18 AM