Great concept but I really wish this worked.
“Current heading” says “no reading” on my 2016 iPad and iPhone7Plus (iOS 15.7.6). On my iPhone4S, it did show a heading for a few minutes but I haven’t gotten it to work since. I would like to use it to let me know when my boat changes direction suddenly due to tide/wind so I can adjust my solar panels and also make sure my anchor trip line (led back to the bowsprit with a weak link) doesn’t get snagged by the keel as the boat rotates. If it works, I wouldn’t mind paying for it. And I don’t buy apps often! I hope the author finds time to fix it but maybe he’s out sailing? Fair winds and following seas.