A means to temporarily mount the sun compass, such as tape or clamps. Two is better, since one can serve as a look-out for boat traffic and obstructions.
Calm seas are also a major benefit.
Due to movement of the sun, you should try to accomplish each task within 5 minutes or you will have to reset the sun compass. Don't try to continue where you left off. Compass Compensation Have the sun compass ready to be locked in position. You may be able to tape a piece of plywood to the seat backs and then clamp the sun compass to the plywood. Repeat the process.