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Mobile smartphones get their GPS signals from Assisted GPS (AGPS) chips. AGPS is great in populated areas because it uses cellular networks, Wi-Fi, and other signals and hints to quickly get a rough idea of your location, which in turn helps the chip quickly find and connect with GPS satellites for more precise location data.

Unfortunately, this advantage is lost when you’re in rural areas, particularly if you lose your cell network connection. Then the weakness of the AGPS chips becomes apparent: dedicated GPS devices are much better at getting a precise location from GPS satellites.

Furthermore using an external unit for your GPS significantly increases the battery life expectancy of your smartphone or tablet

This range of Bluetooth GPS Receivers are designed for aviation and provide a dedicated GPS signal to your tablet or phone via bluetooth. These receivers offer precise location from GPS satellites than in-built devices by removing the uncertainty of GPS signal drop off.