Aligning The Compass Heading - Raymarine SPX-5 Installation & Setup Manual

Chapter 3: Commissioning & setup
Minimum of
2 circles
If the deviation figure exceeds 15° or the display shows no deviation value, the
compass is being affected by ferrous objects on your boat. You should move the
compass to a better location. Higher deviation figures are acceptable on steel boats.

Aligning the compass heading

Once the deviation is displayed, press disp to move to the Heading Alignment
(ALIGN HDG) page, then:
1. Manually steer the boat on a steady course at a speed sufficient to hold the
course.
2. If you have a GPS connected to your SPX-5 Wheel system:
i. Increase the boat speed to more than 3 knots.
ii. Press auto. The SPX-5 Wheel system will then set the heading to agree with
the COG (course over ground) heading received from the GPS.
As many factors can cause a difference between heading and COG you must fine-
tune the heading alignment so it matches the boat's steering compass (or a known
transit bearing). To do this:
1. Use -1, +1, -10 and +10 to adjust the displayed heading until it matches boat's
steering compass (or a known transit bearing).
2. Hold down standby for 2 seconds to exit Seatrial calibration and save the new
compass settings.
Turn boat in slow circles so:
• boat's speed stays below 2 knots
• each circle takes at least 2 minutes
Keep turning the boat until
you see the DEVIATION screen
37
Start
turning boat
Autopilot heading
D10542-1