Radios with model names ending with a “1″ e.g. DP-3601 (Portable) or DM-4401 (Mobile) have an integrated GPS receiver. This receiver is purely a reporting tool (i.e. the radio user cannot see where they are like on a traditional GPS unit). MOTOTRBO radios uses a protocol called LRRP (Location Request Response Protocol) to send GPS updates to a predefined Radio ID (i.e. destination address). LRRP uses triggers to schedule GPS updates: these include GPIO event; delta time; delta distance or immediate.

GPS updates are processed by a location server (effectively a standard PC with a tracking application on it). The operator (person) sends a location request to a radio via the tracking application installed on the PC. The server is connected to a Control Station, which is used to send the request. This location request contains information about the triggers: for example, send GPS data every ten minutes or every 1 kilometer, whichever happens first (this is chosen by the operator via the location application).

The Control Station can be any MOTOTRBO radio – mobile or portable. The radio is connected to the server via a standard USB cable. This radio would be programmed to monitor the radio channel or system.

Note that as of system release 2.2, control stations are not required and certain Application Partner products are able to access the radio network directly via the repeaters. This uses the NAI feature (Network Application Interface).

The radio stores this location request and when one of the triggers have been reached, the radio sends a GPS packet (takes less than 600ms). The GPS is sent as UDP/IP data over the air, to the predefined Radio ID. The radio which receives this packet forwards this to the PC, which displays the radio location on a map. There are different ways to handle the GPS update, in terms of channels and coordination.

Another MOTOTRBO feature which works hand-in-hand with GPS is ARS (Automatic Registration Service). This causes the radio to send a registration packet every time the user switches on or (optionaly) changes site. ARS is also supported in non-GPS models.

The map and location request management, is part of one of many possible applications from several possible Motorola Application Partners.

More details on how GPS is handled in MOTOTRBO can be found in the MOTOTRBO System Planner. More information on which Motorola Application Partners produce GPS tracking applications can be found in the Application Partner Catalogue. Both of these documents are available to Channel Partners, for download from Motorola Online. The Application Partner catalogue is available for download on my Blog or on Motorola’s website.

If you dont have access to Motorola Online, you can request a copy of the latest MOTOTRBO System Planner from your Motorola Supplier.


The instruction below are for the Brandmeister DMR Network. For other DMR networks, just substitute the information specified for the information needed for the network required.

First you need to go to and make the changes found in the image below.

Now we can set the parameters in the CPS for your Motorola Radio. Put your DMR ID in the RADIO ID field required if not already there and check the GPS option.

Next change the following in the Radio Network and Services sections.

– CAI Network: 12
– ARS Radio ID: 5057
– TMS Radio ID: 5057

The following setting need to be changed with in each channel that you wish to beacon your location.

Channel Settings:
– ARS: On System/Site Change
– IP Site Connect: On
– GPS Revert: Selected
– Data Call Confirmed: On

Now that you have set all the parameters, upload the codeplug to your radio. You can now head on over to and enter you callsign to view your location.

Other Countries Settings

I have done a little research to other ID’s used. However, you should check for yourself as to which ID you should use to beacon you GPS position. However, the settings above should work without any issues.

Australia connected repeaters, use 5057
USA connected repeaters, use 310999
Germany connected repeaters, use 262999
South Africa connected repeaters, use 655999

Hytera Radio’s

I have also found information for Hytera radios which can be found HERE. There is also documentation over on the Phoenix DMR Network that you might want to have a look at too. However use 5057 and the BrandMeister DMR Network procedure to set up for use on BrandMeister. These documents has not been confirmed be me and are provided UNCHECKED

My Motorola DM-4601

Here is my Motorola DM-4601 or DP-3601 beaconing the location of M0GLJ-9 via the Brandmeister network into the APRS network.


If you have trouble setting up your radio, please feel free to contact me or visit the BrandMeister Network Wiki