Motorola MTP830 S Product Information Manual page 66

66 | Services and Features
Important: Where the signals from satellites are not available, the GPS Location Service does not work.
This situation usually happens when your radio cannot establish a view of a wide area of open sky, for
example, when your GPS 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 GPS Location Service feature provides a location, most probably near to your actual location. For
GPS feature performance, under ideal test conditions see Table "GPS Specification"
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 in two ways using:
• SDS
• Packet Data
If the Location Reports are sent over the Packet Data, a Packet Data icon is displayed when the message is being sent.
If the Location Reports are sent via SDS with User Defined Data Type-4 as a transport layer, either the ETSI Location
Information Protocol (LIP) or Motorola Location Request/Response Protocol (LRRP) GPS Location Protocol is used.
The LRRP GPS protocol either use SDS-TL (for added reliability) or Simple GPS with no SDS-TL (for saving air
interface resources). GPS Protocol Identifiers are:
• LRRP SDS TL = 131
• LRRP Simple GPS = 3
• LIP GPS = 10
Location reports are sent in TMO and can also be provisioned to be sent in DMO. If the radio is provisioned to
provide user indications, the feature operational status is indicated on the radio display. Also, if configured by service
provider, the radio gives an audio-visual notification upon reception of LIP command.
Depending on the radio configuration, 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. The GPS Location Service feature
can be enabled or disabled as a whole using the CPS. It is possible to configure the feature parameters using the CPS,
or over the air. The CPS configuration provides a default profile. The commands received over the air may overwrite
the default profile configuration. The profile assigned to the radio determines when to send location data, what data to
send with what accuracy and to what address. All data requests and configuration commands received over the air are
checked to confirm they have come from a trusted source. Location reports are accepted only from authorized ISSIs
or IPs, depending on the configured transport layer (SDS, Packet Data).
Note: Ensure the application receiving location messages uses valid addresses which are set up on radio as
an authorised ISSI range. Otherwise the radio rejects all system GPS requests.
The radio supports GPS triggers functionalities (using LIP or LRRP) to report GPS positions when the radio meets a
set of criteria. The following triggers, together with their specific parameters, can be set up by service provider:
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