Members of the Dartmoor Rescue Group and the police helicopter are helping police officers search Dartmoor for a missing man from Plymstock.
Police are growing increasingly concerned for the welfare of Martin Hough, 53, from Plymstock who is believed to be on Dartmoor.
Mr Hough was reported missing to police on Sunday, March 16 at around 7.15pm.
He was last seen at around 9.45am that morning at an address in Rocky Park Road, wearing jeans and a blue/black check shirt and black boots.
He is described as white, 5ft 10-11ins, clean shaven, with a shaven head, of stocky build and walks with a limp.
Officers are currently searching the Burrator Reservoir area after his car was found there.
Anyone who sees Martin is asked not to approach him but to call police on 101 quoting log 745 of 16 March.