Emergency crews pulled the wrecked fuselage of the Super Puma out of the sea on Saturday.
The black box from the Airbus EC225 has now been sent to England, where investigators will listen back to the flight box recording to try and piece together what happened in the final moments before the crash.
A minute’s silence was also held outside the Petroleum Museum in Stavanger.
Relatives of those killed also had a chance to visit the site of the incident where it crash at Turoy, west of Bergen.
Members of the Air Accident Investigation Branch have flown out to help the Norwegian Civil Aviation Authority, while two technical experts from Airbus Helicopters in France are also going to assist in the probe.
Last night, First Minister Nicola Sturgeon offered her condolences to the families of the 13 people killed in the tragedy.
As well as Iain Stuart, of Laurencekirk, there were 10 Norwegian passengers on board employed by Halliburton, Schlumberger, Aker Solutions, Statoil and WellTec.
Helicopter operators CHC lost two pilots, a Norwegian and an Italian.
Ms Sturgeon said: “An incident such as this is felt deeply throughout the oil and gas sector especially those who work round the clock in the North Sea.
“Our thoughts are with the family and friends of Iain Stuart, and of the other 12 people who were killed in this tragic accident.
“We will remain in contact with the Foreign and Commonwealth Office, who are liaising with Police Scotland to offer help and support to the family at this sad time.”