Quick-fire questions & answers

Why are some shared screenshots JPEG s, not PNGs?

Before iOS 11, all screenshots taken in iOS stayed as PNGs. Now, some devices share them in JPEG format instead. This behaviour appears to vary by device model, as well as the method used to share. Experiment to check which format is used, by checking the file extension when saving the received file.

Can Compass show OS grid references?

No, only your latitude and longitude. Map grid references are national locators, peculiar to each mapping system. Ordnance Survey’s free OS Locate app can do it. Specialist apps like HamLog ($0.99) also give international Maidenhead locators if you want walking times and routes.