# Jeo: Altimeter & Elevation — Geodetic Altimeter & Compass

> Geodetic Altimeter & Compass (iPhone/iPad app by Omer DELIBASOGLU.)

- Source: https://appshunter.io/ios/app/jeo-altimeter-and-elevation/id6791674087 (this page in markdown: same URL + `.md`)
- Developer: [Omer DELIBASOGLU](https://appshunter.io/developer/6790763818)
- Category: Lifestyle, Navigation
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 130 MB
- Languages: American English, Arabic, Czech, Danish, Dutch, Filipino, Finnish, French (France), German (Germany), Greek and 20 more
- Released: 2026-09-17
- Data updated: 2026-10-08

## What is Jeo?

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.

## Is Jeo safe?

Not enough ratings yet to assess Jeo.

## Is Jeo legit?

Jeo: Altimeter & Elevation has limited verification signals. The AppsHunter Legitimacy Score for Jeo is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.5.13 — 2026-10-08

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

### 1.3.0 — 2026-09-22

• Redesigned settings with modern cards and simplified theme picker
• Stronger background alerts: fixed thresholds and elevation change work independently, with shared alert rules
• Expandable weather and motion badges on the home screen
• New keep-screen-awake shortcut
• Qibla card Arabic layout fix
• Performance and stability improvements

### 1.2.7 — 2026-09-20

Added new features and improvements to the notification panel.

Refined design and interface elements across the app.

Performance optimizations and minor bug fixes.

### 1.2.4 — 2026-09-18

*More Stable Qibla Compass:** The compass needle and direction tracking are now smoother and more reliable; the calibration screen closes automatically once accuracy is restored.

*Improved Notification Experience:** Setting up alerts is now more seamless, with improved background delivery reliability.

*Simplified Settings:** Adjusting distance thresholds is now more flexible and intuitive.

*UI & Permission Enhancements:** Added helpful guidance to permission screens and made in-app prompts smoother.

*Language & Layout Fixes:** Updated translations and resolved text alignment issues across various languages, alongside minor typo corrections.

* General performance and stability improvements.

### 1.0 — 2026-09-17

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-08.*