Recent scale changes to some NACO IFR Low Altitude Enroute charts have necessitated corresponding changes to the ASA Instrument Plotter (CP-IFR) which now accommodates both NACO and Jeppesen charts.Made of Lexan. Features 12 scales to accommodate all instrument charts, including a conversion scale for Nautical and Statute miles; holding patterns depicted; and compass roses.ASA's instrument plotter features: 12 scales to accommodate all instrument charts, including a conversion scale for Nautical and Statute miles; holding patterns depicted for both Standard and Nonstandard entries; compass roses allowing quick course and bearing information; and professional layout enabling easy reading during enroute spot checks. Made of durable Lexan resin so plotter won't warp or break in extreme temperatures guaranteed! Lifetime warranty.