I have a Trackimo GPS tracker that I attach to my H when ever it leaves my house. I bought it Just in case it crashes so I can find it.
There are a lot of different ones out there now that you can choose from. Trackimo was one of the few available when I got my H a few years ago. They are smaller now so they are not that noticable or maybe you can find one small enough to fit inside the H some where. Mine works great..I can locate it no matter where it is. It used GPS or cell towers for location if it can get a GPS signal..
Best 3G GPS Tracker Devices - Trackimo