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I have a bluetooth one, chosen over SD, for a few reasons. Primarily, GPS maps are huge so you'll need an SD card to hold them If the GPS is in that slot...well, you're sol. Also, I can use it with other computers (laptops, etc.) - I prefer flexibility. Furthermore, I can keep the GPS in a location in my car where it's out of the way and gets good reception without worry whether I can glance at the screen or not. I have the Belkin GPS - not the best but I wanted to start inexpensively for my first GPS endeavour. One thing about the Belkin that's great: sensitivity is very high- I can keep it in the console inside the dash without direct line of sight to the sky and I still get 8+ satellites. But, to the point, I'd stick with a bluetooth one so your sd slot is free for storage.
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