The GBT-709 is among one of the most preferred Bluetooth GPS receivers produced by Taiwanese makers Altina. The GBT-709 not only gives you good performance, it comes in a very affordable price range as well which is getting lower every day.
The Altina GBT-709 works in pretty much the same fashion like all other generic Bluetooth devices. It fixes a position from the satellite and transfers the particular location data (in NMEA0183 V2.2 format) into the handheld device that you are using through Bluetooth. The Bluetooth GPS devices are incapable of getting you from a particular point to the other, therefore they make use any kind of navigation software to locate your position on the map or direct you the way using street level mapping data that it keeps in its storage.
The GBR – 709 is 69 x 50 x 19 mm in dimension and makes use of the SiRF Star III GPS receiver. It also comes with an integrated lithium ion battery which can last you about 12 hours. The GBR – 709 can tract around 20 satellites at a time.
From: about-electronics
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