"There were around 60 people involved in the search today, and we will download and analyse the GPS data overnight in order to identify and prioritise the areas to search tomorrow," Canterbury Rural Area Commander Inspector Dave Gaskin said.
"So far the search has not found anything to indicate where Murray may be."
Police said today Mr Edge (63) became separated from a friend while hunting in the upper reaches of the Tengawai River.
Insp Gaskin said the search started about 7.30am yesterday, after Mr Edge's hunting companion was able to call for help from a nearby farmhouse.
He had spent the previous night searching for Mr Edge.
"There is no mobile phone coverage in the area and neither hunter had a PLB [personal locator beacon] with them," Insp Gaskin said.
"We had teams searching most of the day yesterday and they have gone out again today."
An aerial search yesterday was hampered by the weather, terrain and bush cover, and the weather conditions in the area are not expected to improve in the next few days.
"While the search area is quite small it is covered in low scrub and vegetation with lots of steep gorge type creeks. Combine this terrain with the camouflage clothing that Murray was wearing and you can appreciate how challenging and time consuming it will be to search the area properly."
Canterbury Police SAR and volunteer SAR teams from Twizel, Lake Tekapo, Fairlie and Timaru have been joined by local farmers and friends to spend a second day searching the upper reaches of the Tengawai River in South Canterbury today.
