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Tacan Tactical Air Navigation
TDOP Time dilution of precision, See DOP
Time To Go (TTG) Digital reading showing the time remaining from your current position to the next waypoint. This function takes into account your Distance To Go (DTG), and your Velocity Made Good (VMG) to give you as closely as possible the amount of time left to reach your waypoint. Displayed in hours, minutes and seconds, it will continue counting down until your waypoint is reached.
TOE Time of Ephemeris.
TOW Time of week, in seconds, from midnight Sunday UTC.
Translocation A version of relative positioning that makes use of a known position, such as a National survey station, to aid in the accurate positioning of a desired new point. The initial position (coordinates) is used as a starting point, then the three-dimensional differences measured by GPS are used to calculate the position (coordinates) of the second point.
Trop Tropospheric correction. The correction applied to the measurement to account for tropospheric delay.
Tropospheric correction The correction applied to the measurement to account for tropospheric delay.
True and Magnetic North True north is the top of the world, where all lines of longitude converge. Magnetic north is the location our compasses point to; it lies several hundred miles to the south of true north, at a location in Canada.
True Bearing The bearing of an object relative to true North. If you are facing East with an object to your South, it has a true bearing of 180°.
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