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© Satmap Systems Ltd
© Satmap Systems Ltd 2014
99
22. Glossary (... cont)
coordinate system is a grid based method
of specifying locations.
VMG. Velocity Made Good is the effective
velocity towards a target, after the effects of
crosswinds (especially relevant to aircraft),
currents (watercraft) and terrain (walkers/
cyclists who have planned on walking at a
certain speed) have taken effect. It is the
forward component of velocity.
WAAS. Wide Area Augmentation System. This
is a GPS augmentation system in the U.S.
which enhances the accuracy of GPS.
Warning Radius. Distance at which the unit will
sound beeps indicating the vicinity of a POI,
GoTo point or a route.
Waypoint. Set of coordinates that identify a
point on the map and make up a route ('route
points'). Waypoints are usually placed at turns
in the path or where the path changes.
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