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After years of reviewing PND after PND, it's hard to get excited about a GPS device's physical form.
The cable also powers the cradle's loudspeaker and integrates the FM/HD Radio antenna that receives the free, lifetime over-the-airwaves traffic data that transforms the Nuvi 3597LM into the Nuvi 3597LMTHD that I tested.
The upside of integrating the antenna into the cable is that it makes a thinner device possible.
Tapping it again causes the device to instantly reawaken.
For those times when you need to shut the Nuvi down for extended periods of time, such as when packing it for travel, holding the power button for a few moments will totally shut down the device.
That connection enables hands-free calling using the PND's microphone and speakers, and a feature called Smartphone link, which we'll get to momentarily.
Upon pairing with a smartphone, the Nuvi will attempt to sync the phone's address book -- although just the numbers, not the addresses -- which can be accessed via a phone menu.
The Nuvi features an internal accelerometer of some sort and its display can rotate between portrait and landscape orientation for the maps and menus.
Along the bottom edge of the Nuvi 3597LM is a small slot where a micro SD card can be inserted to increase storage for downloadable maps and updates.
Also on the back panel is the Mini-USB port for charging the Nuvi 3597LM and updating the software with the aid of an Internet-connected computer, Garmin's proprietary 12-pin dock connection, and a very tiny integrated speaker behind a drilled grille.