We manufacture a line of radio based GPS transponders that are compatible with the Gurtam Wialon platform. Each device includes a GPS receiver and radio transceiver to transmit GPS positions to other similar transponders within radio range. As the transmissions are direct radio-to-radio messages a cellular based network is not required, and the devices will work in any remote area where Navstar GPS signals can be received.
Any of the devices can receive messages for output to the tracking software. Radio range varies greatly by terrain and locations of the transmitters an receivers, but is commonly about 20KM although distances of 200KM have been obtained in some special circumstances. Any receiving device can be readily interfaced to the Internet or other IP backbone, to relay received GPS reports around the world.
Radio frequency issues can often be resolved and the transponders are available in a wide variety of frequency bands including 150MHz and 450MHz bands
For more information please contact me.