Do this the moment you close the car door, before you walk anywhere. It takes one tap and it is the single most useful thing in this app.
▪ A phone browser stops recording when the screen sleeps or you switch apps.
Keep this screen awake with the button above, or accept that there will be gaps — and the app will
show you exactly where they are rather than quietly joining the ends together.
▪ The battery is the real limit. Carry a power bank. A dead phone is a dead instrument.
▪ Iron and canyons lie to the compass. The bearing may be wrong where the dip readings are not.
▪ This does not replace a map, a compass, and telling somebody where you are going and when you
will be back. It is one more layer, and the layer you should not be relying on alone.
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