Raymarine ST70+ Installation Manual page 53

Chapter 3: Commissioning Procedures
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
• 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
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
OK
press
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
AutoLearn entry page.
ng
or NMEA), the autopilot is set
to continue to the AutoLearn entry page.
OK
to continue calibration:
Align to GPS
N N
W W E E
S
Steer the boat on a steady course.
i
Press CANCEL to exit.
Press OK to continue
Compass Offset
N N
W W E E
S
Heading M
Use +1 and -1 buttons or rotary to
i
adjust the heading.
Press OK to accept
OK
to continue to the
43
OK
6°
240°