Simrad AP26 and AP27 Autopilots
True bearing – Bearing relative to true north; compass bearing corrected for compass error.
True heading – Heading relative to true north (the meridian).
Waypoint - A discrete point, stored in a navigator, located on the surface of the earth. Normally this point will be identified by Lat/Lon coordinates although in some systems it may be shown by T.D.'s.
XTE - Cross Track Error - Used to identify a vessels position relative to a straight line drawn between two waypoints. The amount the vessel is off to the left or to the right of this line is known as the track. It is normally displayed in thousands of a nautical mile, equal to 6 ft or 1.85 m.
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