Scale Rule – NM-2 ( nautrical miles / scale 1 250 000 / 1 500 000 )
- Convenient length (240mm x 38mm) for cockpit use.
- Outside edges respectively read to 110nm in 1:500,000 and to 55nm in 1:250.000.
- Centre scale converts between Kilometres (KM) 1:500.000 from 0–200km and Statute Miles (SM) 1:500,000 from 0–125nm.





