Hard to find militaria collector's item of the Kriegsmarine

Marks fully preserved. Naval acceptance eagle M 901, WSA E - BE, W. Sch.- Amt, ED 7, cln 11573. Very well preserved original paint with slight signs of wear. Works perfectly.

Material: brass

Dimensions: 68 x 15.5 cm

The double protractor is used for navigation near the coast. You look for three fixed points, measure the two angles e.g. with a sextant, sets the angle on the double protractor and places the protractor on the nautical chart so that the legs run through the points. The vertices give the location.