User's Guide

Location Services
Your radio may be customised and enabled for location services, such as GPS or other regional
Global Navigation Satellite Systems (GNSS), that allows the radio to determine your location
(longitude, latitude and altitude) and provides both timed- and distance-based reporting.
The generic location services function on the radio is called 'GPS' and it provides support for multiple
regional GNSS including BeiDou2.
The behaviour of the GNSS function is highly customisable, both by customisation of the radio and
over the air from a control room application. Your radio may also be customised to send position data
automatically alongside TETRA Alarm Calls or Status messages. The destination to which any
reports are sent may be changed over the air. If your radio accepts a change of destination
command it sounds a customisable tone and sends you an SDS message to inform you.
If customised, you can enable/disable the GNSS function, see Reporting options on the facing
page.
For the best performance, your radio needs an uninterrupted view of the sky.
Position
To locate your position
1. Select Menu > GPS > Position > Locate.
While the position is being calculated the icon flashes.
Position information
When the position has been determined the following information is displayed:
Latitude and Longitude values.
Fix indicates how accurate the reading is:
2D indicates that less than four satellites were used to determine the position
3D indicates that at least four satellites were used.
The number in brackets indicates how many satellites were used.
Age shows how long ago the position was first displayed; to refresh the reading press Locate
again.
GPS/BeiDou2 shows the number of satellites used in the selected system. Note that the
name of the selected GNSS is customisable.
104 SC21 Series hand-portable radio