Hmm, I may have to try no pre-measurement. May really be harsh for the French with the Poor Gunner rule though!

A bit like the new computer game Naval Action - you have to estimate the fall of the shot, get it wrong and splash! You can fire a ranging shot though (not good if you have a 4 gun schooner!). Aiming in the game is complete with pitching deck and firing on the up roll at long range, etc.