I have a manual 2011 Mk V1 Golf Comfortline 118TSI. It has the basic RCD310 radio with some aftermarket speakers to the front stage. I'm looking for an aftermarket GPS unit. As I only plan to use it infrequently I wont need it permanently installed or to replace the RCD - just looking for another cheap aftermarket system that can be removed when not needed. I'm not sure what to look for in regards to maps, features such as speed limit annoucements, direction announcements, safety camera announcement, etc. Has anyone gone down this path? Does anyone have any suggestions?

Thanks Tony