User's Guide

 28
After the TU has connected to the GSM network (see
Initialising a TU on page 27) it will attempt to get a GPS
location x.
If the TU displays REMOVE UNIT AND GET GPS
(Figure 1) the GPS signal is too weak indoors, and you must
take the unit outside to get a GPS x.
To Get a GPS Fix:
1. Lift the TU from the Dock and take it outside to an area
with a wide, clear view of the sky, away from any tall
buildings.
2. Stay still until the tracker displays
GPS OK: PUT UNIT BACK IN CRADLE. (Figure 2)
3. Go back indoors and place the TU back into its dock.
4. While the TU continues to initialise, measure the subject’s
ankle and select the correct size of strap. (See
Preparing
Straps for Installation
on page 29).
5. Next, t the PID to the Subject’s ankle,
(See
Fitting a PID to a Subject on page 30).
Getting a GPS Location Fix
GPS OK:
PUT UNIT BACK
IN CRADLE
Figure 2—GPS OK
REMOVE UNIT
AND GET GPS
Figure 1—Get GPS Location Fix