This fits your .
* Linograph Military(half moon protractormilitary map reader)Romer Marking Map Reading Protractor.
* Bottom line respectively reads to 3.3 kilometers in 1:25000 metersBottom but second parallel line respectively reads to 3 kilometres in 1:50000 metres and 1:63360 metresHalf moon shapeouter edges owns 0-6400 miles and 0-360 degrees black printings on transparent disk
* Color: Clear | Material: Acrylic.
* Brand: Linograph.
* Product Size: 11 Inches(Approx.)
* Sale For: 1 Piece
* Using the RA protractor:
1) The protractor should always be used when plotting grids and bearings.
2) Always check the scale of the map and scale of the romer when plotting grids.
3) Tape up the yard scale romer to avoid mistakes.
4) Use a line of fine cord from the centre point when plotting bearings a plumb line.
5) Place the protractor over the map and align the northings and eastings with the zero lines and romer grids.
Linograph Clear Acrylic 11 Inches Map Reading Half Circle Design Protractor - B071HBXRXM