Despite being submerged at periscope depth in rough seas the stadimeter is pretty darn useless given the amount of up and down heaving the boat does. Interestingly enough the rocking of the boat at periscope depth in rough seas in SHIV has been toned down greatly making the stadimeter a breaze to use under any sea condition.
Greyrider made several periscope ranging charts which I have saved on my hard drive. If you PM me your email address I can send them to you. However, the charts were made with the 6x max zoom for the periscope and if you're using GWX the max zoom has been upped to 10x so you'll have to use the SHIII Minitweaker to reset it back to 6x.
edit: Oh yeah whiz wheels are cools too!
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