Problem solved! Thanks to the crew of Sailnet.....getting ready for ASA 105 written test and for the life of me I can't figure these two problems out? any step by step solution would be greatly appreciated. Your are on a compass course of 300 degrees when you note the monument and the lookout tower on Cuttyhunk Island are in line. Using s Pelorus you determine that the transit formed by the monument and the tower is 130 degrees to starboard. What is the deviation of your compass for this heading?....and the second question is a compass course of 317 degrees and a pelorus transit of 064 degrees to starboard again solving for deviation. I'm too old to be school material, in my youth I was a math wiz but now too many brains cell have retired on me when I need them the most. I just don't understand the process to solve these questions thanks augie