Magellan MobileMapper - GPS Software User Manual page 92

Post-processing: Differential corrections applied to GPS posi-
tions in a PC - after both rover and reference data are logged
and downloaded. Post-processing is slower but more accurate
than real-time differential correction.
RTCM: Radio Technical Commission for Maritime Services.
Commonly refers to a format of real-time DGPS format.
Reference Station: A stationary GPS receiver logging, or
broadcasting, data from a known point. The data is used for
differential correction. Reference Station is synonomous with
Base Station.
RINEX: Receiver Independent Exchange Format. A "univer-
sal" GPS measurement data format designed to allow compat-
ibility b tween different brands of GPS receivers.
Shapefile: A set of GIS files invented by ESRI but published
as an open file standard readable by most GISs. A shapefile
consists of a map file (SHP), a file containg feature descrip-
tions (DBF), a file relating the map locations with the feature
description (SHX) and sometimes a file containing coordinate
system information (PRJ).
Waypoint: A pre-determined coordinate point to which a GPS
receiver can navigate. GPS receivers can also log waypoints in
the field for later navigation. GPS for GIS receiver have largely
replaced waypoints with point features.
WGS-84 coordinate system: World Geodetic System, 1984.
The coordinate system is used by GPS receivers for computing
their positions.
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