XT Racing GPX Pro, User Manual, Page: 56 / 95

GPX Pro Manual 52
© 2009 XT Racing
Delete all sessions for a track - this deletes all races at a track, but does not delete the track
information (start/finish/splits).
Delete all sessions -- deletes all races in the GPX. All tracks remain.
Delete all tracks and sessions -- deletes all races and tracks.
NOTE: for all of the above delete operations, only those sessions
and/or tracks are deleted in the corresponding mode. For
example, in Circuit mode, only circuit mode races and/or tracks are
deleted; in Point-to-point mode, only point-to-point races and/or
tracks are deleted.
Delete options in Drag mode
Delete last viewed session - deletes the last session that you viewed when scrolling through
sessions. Only that one session is deleted.
Delete all sessions - deletes all Drag mode races.
1.9.11 Other Notes
The maximum lap or race time displayed is 9 hours, 59 minutes, 59 seconds. The display will
“freeze” at that point if the lap time exceeds that time.
In circuit mode, if you have the GPX turned on in your car, for example, when just driving
somewhere, once you hit the “starting speed”, it will think you are racing and begin looking for a
track or loop. The GPX will actually start storing data, but that data will be automatically deleted
when you go less than “stopping speed”, or if you travel more than 15 miles.
1.10 Introduction to GPS
The Global Positioning System consists of a constellation of satellites orbiting the earth. There
are currently 24+ such satellites in orbit. It is commonly thought that the satellites are stationary
in the sky (“geostationary”) like DirecTV or DishNetwork satellites, but this is not the case. The
satellites are constantly in motion – if they were not, there could be places on earth (imagine a
“canyon” in New York City) where reception could be essentially permanently blocked. Since
they are moving, any “outage” would only last for a little while.
If you are in a big open field, up to 12 satellites should be “in view” at any time. Depending on
cloud cover, atmospheric conditions, etc., less than 12 satellites may be “in view”. On the main
screen of the GPX, the number of satellites in view, and the relative “quality of signal” is