The track point grid shows the data for each track point. Some of this data
is provided by the GPS unit and some is calculated by RealSpeed. The minimum
required for RealSpeed to produce a result is the Latitude, Longitude and Time.
But RealSpeed can also use the Doppler speed, Direction, Vertical speed,
Altitude, Number of Satellites and HDOP if these data items are available.
The full data items available to show in the track point grid are as shown
here:
A brief description of the track point grid fields:
 | Track - the track point number |
| Seconds - the number of seconds between this track point and the
previous track point in seconds |
| Distance - the distance between this track point and the previous
track point in meters |
| Speed - the average calculated speed between the previous track
point and this track point using the latitude and longitude |
| Direction - the direction from the previous track point position to
this track point position in degrees (0-360) |
| Wind Angle - If a wind direction value is available, this is the
difference between the direction of travel and the wind direction in degrees |
| VMG - If a wind angle is available, this is the speed vector to
windward in displayed speed units |
| Altitude - the altitude value from the GPS in meters, or a
calculated altitude if vertical speed is available |
| Vert Speed - the vertical doppler speed from the GPS if available |
| HDOP - Horizontal Dilution Of Precision - a value that shows how
precisely the satellites can triangulate the position (0.8-50) |
| Invalid - a set of codes to show if this point is invalid. See
below for more detail on what the codes mean |
| Sats - the number of satellites used in getting a fix. |
| Doppler - the horizontal doppler speed from the GPS |
| Total Distance - the total distance traveled from the start point
to this point using positional data in meters |
| Total Doppler Distance - the total distance traveled from the start
point to this point using the doppler speed in meters |
| Run - the run number based on the positional data |
| Doppler Run - the run number based on the doppler data |
| Pos Err - positional error in meters from the GPS if available |
| Doppler Error - doppler error from the GPS if available |
| USOG - unfiltered doppler speed over ground |
| UCOG - unfiltered course over ground (direction) from the doppler
calculations in degrees |
