A satellite navigation system has been stolen from an ambulance while paramedics dealt with an emergency call in Surrey.
Police said the system was stolen while the ambulance was outside a block of flats in Horsell late on Monday night.
The device was programmed specifically for the emergency service and will be useless to the culprits, officers said.
Insp Dave Griffiths said the vehicle was parked in Brewery Road for about an hour from 2355 GMT.
He said: "This offence beggars belief.
"Not only is it despicable to steal this type of equipment from an ambulance which could lead to a delay in the crew getting to an address to help, but it is exacerbated by the extreme weather conditions which the paramedics have been facing."
Describing the offence as "outrageous", he urged anyone who saw anything suspicious to contact the force.