Enhance Gnss Performance - Motorola MTP3250 Feature User Manual

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Chapter 5: Features
• GPS + BeiDou
IMPORTANT:
Where the signals from satellites are not available, the GNSS Location Service does not work.
This usually happens when your radio cannot establish a view of a wide area of open sky. An
example would be when the GNSS antenna is covered or facing the ground. Such situations
include being:
• In underground locations
• Inside buildings, trains, or other covered vehicles
• Under any other metal or concrete roof or structure
• Near a powerful radio or television tower
• In extreme temperature outside the operating limits of your radio
Even if your location information can be calculated in such situations, it may take longer to do so.
Therefore, in any emergency situation, always report your location to your dispatcher. Where adequate
signals from multiple satellites are available, your GNSS Location Service feature provides a location,
most probably near to your actual location.
The radio can be triggered to send Location Reports in various circumstances, for example:
• Upon a request
• Entering Emergency Mode
• At specified time intervals
• At specified distance intervals
The Location Reports can be sent both in TMO and DMO by using:
• SDS messages
• Packet Data (in TMO mode only, with Packet Data enabled on the network by the service provider)
The radio can be configured to give audio-visual notifications upon sending the Location Reports.
Depending on the radio settings, viewing the radio position and the status of the visible satellites is
available. The position may consist of longitude and latitude, UK, or Irish grid coordinates.
5.6.1

Enhance GNSS Performance

Sometimes the GNSS feature is unable to complete a location calculation successfully. You hear an
audible tone indicating that your radio cannot see the satellites.
To maximize the ability of your radio to determine a location fix please note the following guidelines:
• Stay in the open – The GNSS feature works best where there is nothing between your radio and a
large amount of open sky. If possible, go outside, away from tall buildings and foliage. While the
performance in a building is improved by moving closer to windows, glass with certain sun shielding
films may block satellite signals.
• Position your radio to enhance reception – Signals from GNSS satellites are transmitted to your
GNSS antenna, which is in your radio antenna. Hold your radio away from your body, giving the
antenna clear access to satellite signals. Do not cover the antenna area with your fingers or
anything else.
• Stand still – If possible, stand still until your radio is finished determining your location. Moving your
radio at a walking pace while your radio is calculating your approximate location may substantially
decrease GNSS performance.
This feature works best where there is nothing between your radio and a large amount of open sky. To
maximize the ability of your radio to determine a location fix, avoid closed space, tall buildings, and
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