Howdy,
  I have thought about getting a used Garmin to use with OpenStreetMaps.  But, all the garmin units I have tried display a legal agreement when they are turned on.  I won't agree to it, so I never get very far.  Are there hacks for some units to remove the license nonsense?  Pointers to that info would be appreciated.  I have searched google every way I can think of and not found anything.
Thanks.