Jeo: Altimeter & GPS Compass

Jeo is a professional geodetic altimeter, multi-sensor elevation tracker, and terrain analysis tool. By fusing multi-GNSS data, high-precision barometric pressure sensors, and national/global geoid models, Jeo bridges the gap between raw GNSS ellipsoidal height and true orthometric height (Mean Sea Level – MSL). WHY JEO? (TRUE ORTHOMETRIC vs. RAW GPS) Mobile GPS receivers only calculate geometric elevation relative to the mathematical WGS84 ellipsoid, causing vertical errors of ±30 to over 100 meters. Jeo applies high-resolution local geoid separation (N) grids to calculate true orthometric height (H = h - N), delivering survey-grade elevation accuracy to your phone. 35+ OFFLINE NATIONAL & REGIONAL GEOID GRIDS: Centimeter-level undulation accuracy worldwide with zero internet required: • North America: NOAA NGS GEOID18 (USA), xGGM23 (Mexico), GCR-RSH-2020 (Costa Rica) • South America: QGeoidCOL2023 (Colombia), IGM110 (Uruguay), SAM_GEOID2023 • UK & Western Europe: OSGM15 (UK/IE), IGN RAF20 (France), BKG GCG2016/2023 (Germany), swisstopo CHGeo2004 (Switzerland), Austrian Geoid 2008, hBG18 (Belgium), NLGEO2018 (Netherlands), EGG2015 • Southern Europe: IGN REDNAP (Spain), GeodPT08 (Portugal), SLO-VRP2016 (Slovenia), MK_HREF2022 • Nordic & Arctic: SWEN17 (Sweden), HREF2025A (Norway), FIN2023 (Finland), DVR90 (Denmark), NKG2015, ICEGEOID2011 (Iceland), GGEOID16 (Greenland) • Eastern Europe: PL-quasi-geoid2021 (Poland) • Asia & Middle East: HGM TG-20 (Türkiye), JGEOID2024 (Japan), KNGeoid18 (S. Korea), TWGEOID18h (Taiwan), IndGG-SH2021 (India), DRUKGEOID2022, VNLSC2019 (Vietnam), PGM2018 (Philippines), IRG2018 (Iran) • Africa & Oceania: AFRgeo2019, ETH-GM21 (Ethiopia), UGG2014 (Uganda), AUSGeoid2020 (Australia), NZGeoid2017 (New Zealand) • Global Fallbacks: GFZ / ICGEM XGM2019e & NGA EGM2008 SENSOR FUSION, BAROMETER & WEATHER STATION: • Kalman Fusion: Blends barometer pressure shifts (dP/dt) with stabilized GNSS for smooth vertical tracking. • Barometer Weather Station: Live atmospheric pressure (hPa, inHg, mmHg, mbar), sea-level QNH, and trends (Clear, Stable, Storm/Rain). • Motion Filter: Separates physical movement from barometric weather pressure drift to prevent false climb. • GNSS Diagnostics: Live horizontal/vertical accuracy (HDOP/VDOP) and signal quality. SPECIALIZED GEODETIC & FIELD TOOLS: • Differential Altimeter: Barometric relative vertical measurement mode (Δh) to measure buildings, stairs, towers, or cliffs. • 30m DTM Slope & Aspect: High-resolution terrain gradient (°/%) and hillside orientation (Türkiye coverage). • Elevation Share Cards: Clean visual badges with MSL altitude, coordinates, and barometer weather metrics. • Tilt-Compensated Compass: Low-noise magnetometer with automatic declination & 3D calibration. • Geodetic Dashboard: Coordinates (Lat/Lon), ground speed, vertical speed, and address card. • Qibla Compass: Kaaba pointer & geodesic distance meter (optional field orientation). BACKGROUND TRACKING & SMART ALERTS: • Low-Power Monitoring: Continuous elevation tracking with screen off (GPS sleeps to save battery). • Absolute Threshold Alerts: Custom alarms for crossing critical altitudes (e.g., 1,000m, 2,500m). • Relative Step Alerts: Audio & haptic alerts at set intervals (every 25m, 50m, 100m, 250m, 500m). • Reference Benchmark: Pin a datum at your camp or trailhead to monitor net vertical gain. PHYSIOLOGICAL METRICS & PRIVACY: • Effective Oxygen (%): Real-time atmospheric oxygen estimate for hypoxia awareness. • Floor Counter: Converts vertical climb into approximate building storeys (~3m/floor). • 100% Offline & Private: Zero data leaves your device. No ads, no tracking, no account needed. BUILT FOR: • Surveyors & Engineers: Rapid field elevation ground-truthing and benchmark cross-checks. • Mountaineers & Trekkers: Summit verification, vertical speed, and storm alerts. • Aviation & UAV: Quick field elevation MSL checks and altimeter calibration.