Whenever I fly anywhere and land (Off airfield) I am always extremly wary of leaving the helicopter unatended....If you fly somewhere for lunch, its usually a short walk from the landing site to the hotel/pub so you cant easily keep an eye out.
The two places I go are fairly remote but are very close to footpaths....
Obviously it would just take one idiot to either try and break into the heli and take stuff, or have a "fiddle" with some of the control linkages/engine cables etc...
It goes without saying that after leaving the helicopter unatended for any length of time I always do a full walk around, check that nothing has been tampered with.
But what does averyone else do about this? Those doing commercial opps, is it a risk you have to take?
I have often wondered about putting signs up on the windows with my mobile number so if people want to have a look at the helicopter they can call me and have a tour rather than just "help them selves"...
Its a difficult one, I think a portable HT electric fence with CCTV is the only answer