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Magellan NAV 6500/NAV 6510 99
Glossary
Active Leg The segment of a route currently being
traveled.
Azimuth The angular measurement from the horizon
to a satellite or other object.
Bearing The compass direction from your position to
a destination, measured to the nearest
degree.
Coordinates A unique numeric or alphanumeric descrip-
tion of position.
Course The direction in degrees from the start
waypoint of a course line to its destination.
CTS The optimum direction the vessel should be
steered in order to efficiently make headway
back to the courseline while also proceeding
toward the destination waypoint. It is a “com-
promise” course bearing that projects from
your current position to a point on the
courseline mid-way between a point perpen-
dicular to your position and the current leg
destination waypoint.
Datum Refers to the theoretical mathematical model
of the earth’s sea level surface. Map makers
may use a different model to chart their
maps from so positions will differ from one
datum to another. The datum for the map
you are using can be found in the legend of
the map.
Estimated Estimated Position Error is the approximate
Position Error error (between 0 and X) introduced in the
(EPE) ephemeris by the U.S. Department of
Defense for reasons of security. This random
error, known as Selective Availability (SA) is
not due to receiver error and is not signifi-
cant enough to affect navigation for most
purposes (See DGPS in appendix).
Geometric Measures the probable accuracy of a position
Quality fix, based on the position of the satellites
(HDOP) relative to each other.
GOTO A single leg route with the present position
being the start of the route and a defined
waypoint as the destination.