# Altitude Checker — Measure Altitude with GNSS

> Tool to measure altitude at current or selected locations using map data or GNSS. (iPhone/iPad app by Takafumi AMANO.)

- Source: https://appshunter.io/ios/app/altitude-checker/id635168846 (this page in markdown: same URL + `.md`)
- Developer: [Takafumi AMANO](https://appshunter.io/developer/581065340)
- Category: Lifestyle, Utilities
- Price: Free with in-app purchases
- Rating: 4.00/5 from 4 App Store ratings · 17 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 282 MB
- Languages: English, Japanese
- Released: 2013-04-23
- Data updated: 2026-06-07
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/altitude-checker/id635168846/reviews.md

## What is Altitude Checker?

This app is a tool for measuring altitude, either at your current location or at arbitrary points. The app offers two measurement modes: Map Measurement Mode and GNSS Mode.

Map Measurement Mode:

When you launch the app, it enters this mode. In Map Measurement Mode, the app measures the altitude of the center position of a map using a digital elevation model (DEM). The app utilizes SRTM30 V2 data for altitude measurements. If you enable the “Use GSI’s API” switch in the settings, it can also make use of GSI’s API to obtain the altitude of Fundamental Geospatial Data (FGD) in Japan.

GNSS Mode:

Tapping on the “Get GNSS Altitude” button activates the GNSS Mode. In this mode, altitude is calculated using GNSS data. For users with an iPhone 3GS or earlier, the returned value represents ellipsoidal height.

Settings:

- Unit: Choose between Meter and Foot for altitude measurements.
- Special Datum: Select from Default (MSL), A. P. (Arakawa), Y. P., O. P., K. P., S. P., A. P. (Yoshinogawa), T. P. W., and B. S. L.
- Coordinate System: Opt for “Japan Plane Rectangular Coordinate System” instead of Latitude-Longitude.
- Display Address: Toggle this switch to display the address of the current location. When it’s off, coordinates are shown instead of an address.
- Use GSI’s API: As mentioned previously.
- Use GSI Tiles: Choose to use GSI tiles instead of Apple Maps.
- Update to Map Coordinates: Automatically update coordinates on the “Move Anywhere” page to the current position on the maps.
- Use Light Mode for Maps: Maps are displayed in Light Mode, even when Dark Mode is enabled.

About URL Scheme:

- Format: alt://lat/long
- lat: Latitude (double value)
- long: Longitude (double value)

If the latitude is not within the range of ±90 degrees, it will be replaced with the latitude and the longitude.

## Key features

- Map Measurement Mode
- GNSS Mode
- Digital Elevation Model (DEM) data
- Unit selection (Meter/Foot)
- Special Datum options
- Coordinate System selection
- Address/Coordinate display

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Recent user reviews (10 of 17)

All indexed reviews: https://appshunter.io/ios/app/altitude-checker/id635168846/reviews.md

### 5/5 — Perfect for My Needs!

*2025-12-25*

I wanted to scroll across a map to find elevations.  That’s exactly what this app lets you do.  As you scroll, it shows elevations on top of the app.  Perfect for me.  I’ll be driving in the winter and wanted to know elevations — because that’s where it’s likely to freeze, etc.  I tried dozens of apps and found only this one who lets me do that.  Many thanks to the developer!!!

### 5/5 — As good as it get

*2025-02-11*

Simple, accurate, unobtrusive ads. Point to any map location, get altitude, address, coordinates. Thank you developers!

### 4/5 — 事前に知っていれば便利

*2024-11-03, version 3.0.1*

地理院地図のように全体像で見えないため事前に下見をして低地と頂上部分を把握して表示する分には便利です。
高さが波打っていたり意図しない道には対応が難しいので下見が必須となります。

### 1/5 — Accuracy ?

*2023-07-12*

I find this app to be inaccurate as it only measuring +-30m

### 5/5 — 大変重宝しています！

*2020-11-15, version 2.8.9*

住まい周辺の詳細な標高を知る事が出来て、浸水ハザードマップから正確な想定浸水深を確認する事ができました。いざという時の住まいの避難経路計画をより安全にたてる事ができ、感謝しています。ありがとうございます。

### 5/5 — 面白い

*2019-06-21, version 2.8.4*

あちこちの標高がわかるので面白い！
津波などの防災対策にもなりそうです！

### 4/5 — GNSSで測定できる

*2017-05-19, version 2.6.5*

いくつか標高を調べるアプリを使ってきましたが、その場で実際にGNSSを使って測定できるのは初めてでした。私にとって凄く役に立っている訳ではないんですが、行った先々で標高が書いてあると測ってみて「ふーん」とか「おー」とかって具合いに楽しませてもらってます。

### 3/5 — apple地図なので不便.

*2016-11-16, version 2.6.5*

実際にその場所へいかなくても、地図でその場所の標高がわかるので便利なのですが、
記載情報量の少ないapple地図なので、知りたい場所のピンポイントがわからないのが残念です。
特に知りたい場所は山が多く、
他の地図では細い道や階段や建物なども記載されているのに、
apple地図では記載されてないので、場所を特定できません。

### 5/5 — Nice little app for altitude checker

*2016-08-30*

Ever wonder what altitude is your destination? This app quickly shows you just that. Pretty simple.

### 5/5 — 使いやすい

*2015-07-11, version 2.4.1*

いろいろ試したけどこれが満足

## Frequently asked questions about Altitude Checker

### What is Altitude Checker?

Altitude Checker is a utility app that allows you to measure the altitude of your current location or any point selected on a map. It offers two primary measurement modes: Map Measurement Mode and GNSS Mode, providing flexibility for different needs.

### How does Altitude Checker measure altitude?

It uses a digital elevation model (DEM) for map measurements and GNSS data for real-time altitude readings. For Japan, it can also utilize GSI's API for more precise altitude data.

### Can I change the units in Altitude Checker?

Yes, you can choose between Meter and Foot for all altitude measurements within the app's settings. This allows you to view altitude in your preferred unit of measurement.

### Does Altitude Checker have ads?

Yes, Altitude Checker contains advertisements. While the app is free to download and use, you may encounter ads during your session.

### What is the age rating for Altitude Checker?

Altitude Checker has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### What devices is Altitude Checker compatible with?

Altitude Checker is compatible with iPhones, iPads, and iPods. It is designed to work across a range of Apple mobile devices.

### How often is Altitude Checker updated?

The app was last updated on January 2, 2026, indicating active development and support. Users can expect regular updates for improvements and new features.

### What is the user rating for Altitude Checker?

Altitude Checker has a rating of 4.0 stars based on 4 ratings. This suggests a generally positive reception from its user base.

## Version history (last 5 releases)

### 3.1 — 2026-05-15

- Adjusted timeout settings.
- Added new datasources.

### 3.0.2 — 2026-01-02

- Supported iOS 26.

### 3.0.1 — 2024-10-25

- Supported iOS 18.
- Improved address and elevation acquisition process.

### 3.0.0 — 2024-06-14

- Added save and export functions.
- Added ellipsoidal height measurement function.
- fixed bugs.

### 2.9.4 — 2023-10-31

- Supported iOS 17.
- Fixed bugs.

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## More apps by Takafumi AMANO

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All apps by Takafumi AMANO: https://appshunter.io/developer/581065340

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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 2026-06-07.*