dude - if you want a prog to do all the easy, (but easy to mess up!) work for you, drop me a line with a clue to your email on this post, and I'll email it to you, or do some of that fancy PM stuff (never done it myslef, so don't know how it works...). We've got a little gizza calles 'Smorth's logbook calculator' here at Valley, and - let me tell you - the man Smorth is a genius...!!