Pooley’s NM-2 Navigation Ruler (420mm)

The NM-2 Navigation Ruler makes map-measuring a breeze! Standard among flying schools, the NM-2’s outside edges respectively read to 110nm in 1:500,000 and to 55nm in 1:250,000. The centre scale converts between Kilometres (KM) 1:500,000 from 0–200km and Statute Miles (SM) 1:500,000 from 0–125nm.