Raymarine RL80CRC PLUS manual Changing the Heading Mode, True and Relative Motion, Heading Modes

Changing the Heading Mode

4-2 hsb2 PLUS Series Color LCD Display

4.2 Changing the Heading Mode

The radar picture is normally shown with your vessel’s dead ahead bearing straight up, as indicated by the Ship’s Heading Marker at 0° relative bearing. This is the Head Up orientation.

If heading information is available via a SeaTalk or NMEA connection, you can choose a different heading mode. In Course Up and North Up mode you can also select relative or true motion.

True and Relative Motion

Relative motion is the default for the radar display. In relative motion your own ship’s position remains fixed on the radar screen and all radar targets move relative to your own ship.

In true motion, fixed radar targets maintain a constant position on the screen, whilst your own ship moves across the radar image at the appropriate speed and heading. A map-like image is thus displayed, with all moving vessels travelling in true perspective to each other and to fixed land masses.

As your ship’s position approaches the edge of the screen, the radar display is automatically reset to reveal the area ahead of your ship. You can manually reset your ship’s position at any time by pressing the TRUE REL soft key twice.

Heading Modes

The heading modes are as follows:

Head Up North Up Course Up

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Figure 4-1: Radar Heading Modes

•Head Up: The radar picture is displayed with the vessel’s current heading upwards. As the heading changes the picture will rotate.

•North Up: The radar picture is stabilized and displayed with north upwards. As you change heading, the ship’s heading marker moves.

•Course Up: The radar picture is stabilized and displayed with the cur- rently selected course upwards. As you change heading, the ship’s heading marker moves. If you select a new course, the picture resets to display the new course upwards.