Global Positioning Systems (GPS)
Expedition 4 Military Compass
The Silva Expedition 4 Military Compass is a classic baseplate with almost all the scales you'll ever need in the palm of your hand.It has a magnifier for detailed map reading, milimeter and inch scales for all types of map.Great for walkers, trekkers...
https://www.bizrate.co.uk/globalpositioningsystemsgps/expedition-4-military-compass-oid27398394147.html
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