I've been looking at GPS-based navigation devices for a while. What I want is a GPS-based device where I can load detailed maps that would have all highways, roads, and streets in a given area (e.g., south eastern US). I don't want a bike computer with speed, cadence, distance, etc., because I already have that. I only want the navigation/orientation capability (currently I'm using my iPhone and Google maps).
What I'm finding is a number of bike computers that also have GPS navigation, for instance, the Garmin Edge 800 and the new 810. But, like I said, that device has much more than I need (speed, cadence, HRM, training routines, etc.).
I found other devices like the Garmin Nuvi, which seems to have a good size touchscreen, or the (seemingly) bulkier Garmin Dakota. There are also a couple of devices under the generic name of Waterproof GPS (http://www.aliexpress.com/item/Hot-S...676536382.html) and Bike Kit Car GPS Navigator (http://www.ebay.com/itm/Portable-Tou...vip=true&rt=nc).
Any recommendations for a GPS navigation device that has a large screen (at least 4"), has the option of adding detailed maps (providing the equivalent of Google Maps), can be mounted on a bike, and does not include unnecessary (for me) functions such as speed, distance, cadence, HRM, training, intervals, etc?
Thanks in advance.