IceTracker.io

at target
below target
above target

Measure

Walk the ice with your phone. Drill, measure, type in the depth at each of your points. Big buttons, cold hands.

Map

Submit and get a report: your sheet, interpolated. Thick ice in red, target in green, thin ice in blue.

Your setup

Target depth and tolerance, inches or millimetres, your rink size, your measurement pattern.