Police are warning residents in villages south of Lincoln to be wary after a spate of thefts from cars.
Last week, there were eight incidents of thefts in the Washingborough, Heighington and Nocton area.
Police investigations found that in most cases cars had been left unlocked or insecure.
The offences, dating between February 5 and 13, generally happened between midnight and 5am.
Incidents have been reported on The Green, Nocton, Turnberry Close, Park Lane and Lee Avenue in Heighington, and Burton Mews, Fen Road and Gerrard Mews in Washingborough.
Offenders have been stealing anything of value that is easy to remove and carry, though in most of these cases, sat navs were taken.
Officers are also reminding residents to lock their cars and not leave items of value in vehicles.
Police are also asking anyone within these villages that see any suspicious activity or offered items that could be stolen property to report it on 101 or via Crimestoppers.