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For those that use a GPS do you look at the map or depend on the turn by turn audio? The reason I ask is I'm upgrading my hk radio, one option is a head unit that allows me to put my iPhone inside the radio and maintain full functionality to include my Garmin app. The second is a head unit that has a USB connection on the back, I would keep my iPhone perch mounted but have control via factory radio controls. I like the idea of a clean look as option one, I lose visual hence option 2.
I like the screen for the additional info - not just audio turn instructions. Items like distance to turn, distance to destination, altitude etc. Not sure what the IPhone provides though
I currently use just the map, but at times the screen is very difficult to see due to the glare. The Garmin app may just be a viable option for me as well as I already have the hdpdplus.