Police search teams are dusting off a 25-year-old missing person case in a bid to test their new gear.
Joe Freiman, a 64-year-old farmer, went missing during a hunting trip on Stewart Island in 1991 and was never found.
Search and Rescue will today return to the area to resume the hunt for Freiman in order to test a new radio transmitting tool they've been trialling.
About 70 police and volunteers from the Southern District will make use of the SARTrack system as they search the area on foot for two days with no air support.
"The search area is probably one of the most remote parts of New Zealand so it will be difficult for police to provide good communications," Community Constable Dale Jenkins said.