Simrad AP21 and AP22 Autopilots
124 20220596G
8 GLOSSARY
NMEA 0183 - A format (language) designed to permit
communication between various types of marine electronic
equipment. In essence this is a two-wire shielded, serial data link,
permitting one device to talk while other devices listen.
Numerous different sentences are available, permitting
communication between various different devices.
GPS - Global Positioning System - This system consists of 18
satellites plus 3 spares in fixed orbits, circling the earth at an
altitude of approximately 20,200 km. The system will provide the
user with 24 hour a day all weather position coverage, with an
accuracy of 15 to 100 meters.
Loran C - A complex radio navigation network developed by the
US coast guard, to assist a navigator in determining his precise
location. The acronym, Loran C, stands for Long Range
Navigation. It is an all weather 24 hour a day electronic system
of shore based radio transmitters.
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. The AP300DLX has the capability of storing 98
waypoints.
Route - A stored sequence of waypoints. These waypoints will
be listed in the order in which you desire to follow them. The
AP300DLX permits the storage of up to 20 routes.
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 hundredths of a
nautical mile, equal to 60 ft or 18,5 m.
BWW – Bearing waypoint to waypoint - Bearing angle of the
line between the “TO” and the “FROM” waypoint, calculated at
the “FROM” waypoint for any two arbitrary waypoints.
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