Sunset, civil twilight, and how long you have left on the mountain

A countdown to last usable light so you can decide whether to push on or turn back. Shows sunset and the end of civil twilight for your GPS spot, recalculated as you move. The ring drains as dusk gets closer. Quiet, dark, no clutter.
Next high, next low, and whether the gap is wide enough to launch
Runway crosswind component at a glance before you taxi
A glanceable forecast, right in your eyeline.
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Counting to civil-twilight end rather than just sunset is the honest number for the fells — that 32 extra minutes is exactly the decision margin. The draining ring plus 'turn back soon' is a kinder nudge than a raw clock.