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External antenna cable for the nuvi 275T, 1370T, 2370LT, or 2475LT
The separate cable that is packaged with the nuvi 275T, 1370T, 2370LT, and 2475LT is designed to plug into the GTM Traffic Receiver that powers your device. This cable can be used to increase the receiver's ability to pick up a traffic signal in areas where the signal may be weak. This can be the case in some European cities where the signal is not as strong.