The highest-performance 3-axis compass module in its price range

Features 

Complete 3-axis magnetometer draws 16 mAOperation :3.6 - 5 V (unregulated) Part size: 3.3 × 3.1 × 1.3 cm Field measurement range ±1100 µT (±11 Gauss) Resolution Compass heading 0.01°All digital solution, no additional circuitry is required. SPI protocol for interfacing to a processor. Optional CarrierBoard available for easy prototyping and evaluation. 

Applications 

Handheld battery-powered devices with built-in compass feature. High-performance magnetic field sensing. High-performance solid state navigation equipment for automotive, marine, and aeronautic applications. Direction-finding features for any device where bearing or attitude indicators have value.

PNI Prime triaxial magnetic compass module