Damaged Sail Boat For Sale 3D Trigonometry Question?

3D Trigonometry Question? - damaged sail boat for sale

A Coast Guard helicopter between the island and a boat damaged. the angle between the lines of islands in the helicopter and the ship is 73 degrees. The angle to the helicopter spans along the lines of the island and crippled the ship at 40 degrees. A rescue boat to sail from the police and is now at a point 800 meters. From this point, the angle between the lines of the island and the ship is 35 degrees. If the angle is the island between the sight lines for both vessels 68 degrees, find the distance between the helicopter and boat.

I have been long on this issue for over an hour. Please can someone explain the steps to fix it.