Cheap GPS for ride through Europe

[sahtt]

Hi All,

I am not overly familiar with GPS units; never had a need for one until this upcoming trip. The nice motorbike specific units appear to be $500 or more, no thanks.

The bike I'll be using is a 2012 BMW F800. I'm picking it up in Valencia (I live in the States) and likely will not be able to test fit anything except on my RC51. I'll need a flexible mount. IMTbike in Spain wanted 15 Euro's a day for GPS which is crazy in my opinion given my trip will be multiple weeks.

I would like-
a) Decent coverage for all of Europe including Turkey. "Trail" level detail is probably not needed since I will not be going off road.
b) A way to reliably mount it to the bike.
c) One that can tap into a power source on the bike easily. I think the BMW will have something I can use without splicing any wires but I am unsure.
d) The ability to locate camping spots.

What I do not need if it will significantly raise the price-
a) A waterproof unit - I'll put a plastic bag over it and save $200 if need be.
b) Bluetooth anything.

So far I looked at the 'rider' type units dismissed them due to cost.
Garmin nüvi 275/275T 3.5-Inch Bluetooth Portable GPS Navigator with Traffic - looks okay and is <$150. I'll need to waterproof and mount it.
Garmin nüvi 1370/1370T 4.3-Inch Widescreen Bluetooth GPS Navigator with Maps of North America & Europe and Lifetime Traffic - bigger screen, similar features, still <$170.
The Garmin Zumo is nice but it is a minimum of $400. Yikes. Any setup suggestions? Leaving in May so I want to buy one and test it out a bit before i leave.