Instructions on how to steal a satellite navigation system without your crime being detected: 1. Wait for a delivery van to arrive in your street. 2. Watch until the driver gets out of the cab and approaches a house. 3. Creep up on the other side of the van and try the door. 4. If the side door is locked, see if you can jump in through the back and steal the sat-nav. 5. Have your entire attempt filmed by a documentary crew who may show it on prime time television.
I may not be Raffles, the gentleman thief, but when I honed down my master plan in advance of implementation, I think I would decide to leave out part 5, which perhaps marginally increases