In normal operation, indicates "Differential". Differential GPS corrects various inaccuracies in the GPS system to yield measurements accurate to a couple of meters when the mobile is moving and even better when stationary.
Other indications are:
Autonomous: GPS values use no additional correction information.
Last known: Indicates GPS data is either old or not enough satellites are present to achieve a valid location computation.
Invalid: When no GPS signal is present, displays the word "Invalid" and the # of Satellites indicates "0".
The field "number of satellites" indicates the number of satellite signals being received and used to calculate position.
Universal time - uses a 24-hour clock format.
Global position in Longitude (East-West) and Latitude (North-South) displayed using information obtained from a GeminiG3 decoding a valid GPS input signal.
If no previous position was obtained, display shows (Unknown).
Positions are reported in degrees plus decimal minutes.
E.g. : Longitude of 73 degrees, 39 minutes and 45 seconds West would appear as:
073 39.7500 W
The field "Altitude" indicates height above the WGS-84 (World Geodesic System) reference ellipsoid in meters.
Shows the current GPS-generated true course in degrees.
Shows travel speed (in km/h) from GPS-equipped GeminiG3 mobiles.