Jeo: Altimeter & Elevation

Geodetic Altimeter & Compass

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

35+ offline geoid models, MSL elevation, GNSS + barometer sensor fusion, compass, background tracking and DTM slope analysis in supported regions. 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.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

New interface with smoother navigation and a redesigned notification system. We also improved performance, stability, and the overall user experience. Questions or feedback: jeo@halkaapp.com

Version 1.5.13

The developer, Omer DELIBASOGLU, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    Omer DELIBASOGLU
    Size
    135.9 MB
    Category
    Lifestyle
    Compatibility
    Requires iOS 15.0 or later.
    • iPhone
      Requires iOS 15.0 or later.
    • iPod touch
      Requires iOS 15.0 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Location
    This app may use your location even when it isn’t open, which can decrease device battery life.
    Languages
    English and 29 more
    • English, Arabic, Czech, Danish, Dutch, Filipino, Finnish, French, German, Greek, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Norwegian Bokmål, Persian, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovenian, Spanish, Swedish, Traditional Chinese, Turkish, Ukrainian, Vietnamese
    Age Rating
    4+
    Copyright
    © 2026 Ömer Delibaşoğlu
  • Developer Website
  • Privacy Policy

    • You Might Also Like