To: JDavHuston From manxcat,
Regarding ‘Air Almanacs– Don’t they have computerized versions of air and maritime almanacs that are good for decades if not hundreds of years? Forever???
Regarding your explanation for bubbles not being the best alternative: You’ve explained all this to me once before–but it didn’t stick with me the first time around! I got the information in my previous post from the interesting book I mentioned; however, I didn’t mention another part of that same book, which seems to back-up your comment–‘You should have a tripod or other very stable support for all your navigational instruments’.