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Precision Aviation Compass Shield PCNMS-1. Precision Aviation Inc is a reliable manufacture pilots have depended on for years. Precision Avionics Inc presents many brackets for overhead or glare shield mounting. About 30% of the compasses shipped during the last 30 years have been primarily panel mounted. The Precision Aviation Compass Shield PCNMS-1 is a Nickel-Iron-Copper-Molybdenum alloy high magnetic permeability sheet. This sheet provides magnetic shielding from static and low-frequency magnetic fields within the instrument panel that interfere with proper magnetic compass operation.