Robbie Mitchell, from Durness in Sutherland, completed the gruelling 516 miles at daybreak on Friday.
New law would allow satellites and rockets to be launched across the country for the first time.
The A9 was closed after the Scottish Fire and Rescue Service was alerted to an out-of-control fire shortly before 2pm on Wednesday, March 17.
Coastguard crews answered a Mayday call after the boat sank off the north-west Scottish coast.
A 68-year-old man was pronounced dead near the Oykel Bailey Bridge in Sutherland.
The body of Stefan Sutherland was found on the Caithness shoreline six years ago.