Originally Posted by
UCantTouchThis
Carry one of these with you. Only $9, slimline structure and light weight.
If nobody said it yet, this makes me think if there is a phone app that would display both measures (would need to have the phone attached on bike and calibrated), or maybe some cyclo computers might provide such readout?
But that doesn't address the OPs query of getting some idea of the meaning of numbers on his map. But a phone app or some easy conversion chart should exist?