TrueNorth: Compass, Altimeter — Professional-Grade Navigation for Every Expedition

Transform your iPhone or iPad into a professional navigation instrument with the most accurate compass, altimeter, and barometer app available. Whether you're hiking mountain trails, exploring new areas, or need precise measurements for work, our app provides reliable readings you can trust. PROFESSIONAL COMPASS True and magnetic north readings with real-time declination display. High-precision compass rose with customizable orientations. Works with device flat or held upright for maximum versatility. PRECISE ALTIMETER Three altitude measurement sources for maximum accuracy: - Barometric altitude using atmospheric pressure sensors - GPS satellite altitude with vertical accuracy indicators - Ground level API data from global elevation databases Switch between measurement sources instantly based on conditions and requirements. ATMOSPHERIC PRESSURE MONITORING Real-time barometric pressure readings in hPa or inHg units. Essential for weather monitoring and accurate altitude calculations. Manual QNH calibration for professional-grade precision. GPS COORDINATE DISPLAY Accurate latitude and longitude coordinates with precision indicators. Share your exact location when needed. Works offline without internet connection for remote area navigation. MEASUREMENT PRECISION Multiple unit support for international use. Convert between meters and feet for altitude, various pressure units, and speed measurements. Manual calibration options for specialized requirements. ADVANCED FEATURES Vertical speed indicator shows climb and descent rates. Device orientation display with pitch, roll, and yaw measurements. Magnetic declination calculation and display for navigation accuracy. New: In-depth Analytics Module for reviewing your navigation and altitude history, plus Data Export functionality to save and share your measurements. PROFESSIONAL APPLICATIONS Perfect for hiking, mountaineering, surveying, aviation, marine navigation, geocaching, search and rescue operations, and outdoor education. Trusted by professionals who need reliable measurement tools. PREMIUM EXPERIENCE Ad-free interface for uninterrupted use during critical navigation tasks. Clean, intuitive design optimized for outdoor visibility. New: Three additional themes for even more customization and better readability in different environments. PRIVACY AND RELIABILITY Your location data stays on your device. No tracking, no data collection, no internet required for core functions. Works in airplane mode for remote area use. TECHNICAL SPECIFICATIONS Supports both true and magnetic north compass modes. Barometric pressure accuracy to 0.01 hPa. GPS altitude accuracy indicators. Works on all iPhone models with appropriate sensors. Basic functionality is free to use. Unlock the full premium experience with your choice of a weekly subscription (with 3-day free trial), a yearly subscription, or a one-time lifetime purchase for unlimited access. Download now and turn your iPhone into a professional navigation instrument. Whether you're conquering peaks or surveying land, accurate navigation is just a tap away. Compatible with all navigation and mapping applications. Perfect companion for outdoor adventures and professional surveying work. Terms of Use: [https://www.apple.com/legal/internet-services/itunes/dev/stdeula/](https://www.apple.com/legal/internet-services/itunes/dev/stdeula/)