Heading Offset

These settings control an offset to Own-Ship heading. The offset is an adjustment added to the heading sensor data for Own-Ship. This can be useful in situations where the heading value being received is innaccurate. Also, it is needed for use with some PPU devices (typically multi-pod devices) where the orientation of the two pods affects the received heading.

A notice is shown in the bottom-right of the chart display when a heading adjustment is active. Also, a panel labelled Heading (Unadjusted) is shown in the status bar showing the unadjusted value.

Settings

• Heading Offset (Only SEAiq Pilot) : The heading offset is added to the sensor value to generate the heading to use. The default heading offset is 0° (no change). Negative values correct to Port and positive values correct to Starboard. Normally the desired setting is either 90° or -90°. The heading offset is associated with vessels (according to their MMSI). Once changed, the Heading Offset maintains its value. It is necessary to change the setting back to 0° when you no longer need it.
• Calculated Heading : This shows the current (possibly corrected) value of the heading.
• Add 1 Degree : Adjust by 1° to starboard.
• Subtract 1 Degree : Adjust by 1° to port.
• Add 10 Degrees : Adjust by 10° to starboard.
• Subtract 10 Degrees : Adjust by 10° to port.

Common Orientations

• Slave is Forward : Set heading correction to 0° (no correction). This corresponds to the slave being ahead.
• Slave is to Port : Set heading correction to 90°. This corresponds to the slave being to port.
• Slave is to Starboard : Set heading correction to -90°. This corresponds to the slave being to starboard.
• Slave is Astern : Set heading correction to 180°. This corresponds to the slave being directly astern.

Advanced

• Automatic Heading Offset (Only SEAiq Pilot) : When enabled, the user will be automatically be prompted select a new Heading Offset when it differs from AIS heading by more than 30°. When the offset setting is within 10° of cardinal direction (0° / 90° / -90° / 180°) then the cardinal direction is used instead. A prompt will be shown at most once every 5min.
• Use Heading Offset Only for NMEA (Only SEAiq Pilot) : When enabled, heading offset is only when heading is from NMEA. It is not used for AIS sources.