Magellan RoadMate 2200T Reference Manual page 59

The first time you use your Magellan RoadMate, or if you travel over 500 miles with the
unit off, there may be a delay in receiving the initial satellite fix; depending on your
position and the position of the satellites, this could take 15 minutes or more. Normal
usage will receive the satellite fix much faster, but still may take several minutes.
External conditions also affect GPS signal reception. Although weather conditions do
not affect the signal, tall buildings and trees, driving through canyons, wooded areas,
or tunnels, and sitting in a garage or covered parking area can affect the GPS signal.
The GPS receiver constantly monitors and updates the GPS signal status and will
reacquire the signal once it is clear of any obstructions. An external antenna (not
included) provides faster satellite fix times and greater signal strength. Because it is
mounted outside of the vehicle, it is not affected by reflective coatings on windows and
has an unobstructed line of sight to the satellites.
When the Magellan RoadMate is getting good GPS
signals the satellite status bar in the upper right
corner will display green bars.
Tapping on the status bars opens the GPS Status
window. Here you can visualize the satellites being
used as well as a bar chart indicating the strength
of each satellite's signal.
Touch the Xin the upper right corner to return to
the map screen.
3D position fix
Tracking 10