Map Measuring Wheel from Silva
The Map Measurer Path is an analog navigation instrument with a pointer. Useful for measuring orienteering courses or routes in the hills. Made by Silva.
This instrument is for measuring distances of roads, streams, etc. on maps with eight scales; 1:750k, 1:500k, 1:400k, 1:200k, 1:100k, 1:50k, 1:25k, 1:15k. The wheel features kilometre measurements on both sides.