# 国土マップR — 最強の国土地理院地図ビューア。

> Display and overlay various Japanese government-issued maps with offline capabilities. (iPhone/iPad app by keiji matsumoto.)

- Source: https://appshunter.io/ios/app/r/id1321824379 (this page in markdown: same URL + `.md`)
- Developer: [keiji matsumoto](https://appshunter.io/developer/354143756)
- Category: Navigation, Travel
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 50 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.6 · 25 MB
- Languages: American English, Japanese
- Released: 2017-12-07
- Data updated: 2026-09-06
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/r/id1321824379/reviews.md

## What is 国土マップR?

This app lets you display various maps provided by the Geospatial Information Authority of Japan. It can be used within Japan.

You can display a wide range of maps, including standard topographic maps, nationwide aerial photographs, residential land use survey maps, aerial photographs taken during disasters, volcano base maps, lake maps, and more — over 160 types in total!

You can display three map layers at once: an overlay map, a base map, and Google Maps.

The transparency of the overlay map and base map can be adjusted freely.

For maps that have legends, you can display the legend with a single tap.

Maps displayed on the screen are automatically cached up to 200 MB (*), so they can also be used deep in the mountains where there is no mobile signal, or in airplane mode. The app can also be used as a simple GPS app for hiking.

It includes only the minimum GPS features needed to show your current location, making it easy for anyone to use.

You can easily check the elevation at the center of the screen. Please use this feature for disaster preparedness and other purposes.

* When the cache exceeds the limit, older cached data is automatically deleted when the app starts. You do not need to worry about the app consuming all of your smartphone storage.

■ Notes
・Use of this app is at your own risk.
・We assume no responsibility for the accuracy, safety, or reliability of the information provided.
・Please do not contact the Geospatial Information Authority of Japan regarding this app.

Maps: Geospatial Information Authority of Japan
[http://www.gsi.go.jp/](http://www.gsi.go.jp/)

## Key features

- Display 160+ types of Japanese maps
- Overlay up to 3 maps
- Adjustable map transparency
- One-tap legend display
- Automatic offline caching (up to 200MB)
- Simple GPS for current location
- View elevation of screen center

## Recent user reviews (10 of 50)

All indexed reviews: https://appshunter.io/ios/app/r/id1321824379/reviews.md

### 1/5 — 使い物にならない

*2025-07-18*

他の方もレビューしているが、表示速度が遅すぎて使い物にならない。遅いと言うか読み込まない。

### 1/5 — 重い

*2025-06-12*

全く表示されない

### 1/5 — 読み込まない

*2025-05-09*

地図の表示が読み込まないからグリッド線のみで何も表示しない。

### 1/5 — 白地図以下

*2025-03-26*

全く地図が表示されません、白地図でも色無しの地図ですが、どうやらこれは透明な地図のようです。

### 1/5 — 重すぎる

*2024-12-30*

すぐ固まる　iPhone14

### 1/5 — iPhoneでは使えない？

*2024-05-01*

ios14ですが、地形図や等高線を描くのに使い物にならないくらい時間がかかります。旅行に持ち歩くには不適当な気がします。

### 1/5 — 仕様が古い

*2024-03-04*

最新iOSではまともに動かない

### 1/5 — 駄目だこりゃ

*2023-11-09*

以前は使えたのかも知れないが、2023年の現在では地図も表示しないし素人が趣味で作ったようなインターフェースで使い物にならない。国土地理院で検索してWebで見ましょう。

### 2/5 — 重すぎる！！！

*2023-11-06*

標高なども見れていいアプリだが、とんでもなく重い！
重すぎて見れたもんじゃない！
改善してください、よろしくお願いします。

### 1/5 — iOS15だと使い物にならない

*2023-10-23*

おそらくiOSの仕様変更があった様子。iOS12だと地図読み込みが直ぐ終わって表示されるが、iOS15だと永遠に読み込みが終わらず使い物にならない。
最終アップデートが5年前なので、古いverの iOSだと快適に使えるのであろう…

## Frequently asked questions about 国土マップR

### What kind of maps can I view with this app?

This app allows you to display over 160 types of maps provided by the Geospatial Information Authority of Japan. This includes standard topographic maps, nationwide aerial photographs, land use surveys, disaster aerial photographs, volcanic basic maps, and lake charts.

### Can I use the maps offline?

Yes, the app automatically caches displayed maps up to 200MB. This allows you to use the maps even in areas with no mobile signal or when in airplane mode, making it suitable for use in remote mountain areas or during flights.

### How does the map overlay feature work?

You can overlay up to three maps simultaneously: an overlay map, a base map, and Google Maps. You can freely adjust the transparency of the overlay and base maps to customize your view.

### Is this app free to use?

Yes, the application is free to use. There are no in-app purchases or advertisements mentioned in the description.

### What are the primary use cases for this app?

This app is useful for a variety of purposes, including hiking as a simple GPS app, checking the elevation of the screen's center point for disaster preparedness, and general access to detailed Japanese geographic information.

## Version history (last 5 releases)

### 1.1.0 — 2026-06-29

英語版です。

・The overlay blending method has been changed to Multiply. This makes the map display sharper than before. If performance feels slow, please change it to “Settings → Blending Method → Alpha.”
・The search feature has been improved. It now saves search history and performs real-time searches. Coordinate input in latitude and longitude is also supported. For degrees, minutes, and seconds, enter them like “35/59/59.12 139/59/59.12”: use slashes to separate degrees, minutes, and seconds, enter latitude first, then a half-width space, followed by longitude.
・Banner ads are now displayed in the corner of the screen. In the future, it may become possible to hide ads through an in-app purchase.

### 1.0.5 — 2025-07-18

・不具合の修正。しばらくちゃんと動いてなかったようで、すみません。
・各種ライブラリなどを最新版にアップデート。
・上記のためにiOS15.6以上の対応となりました。

### 1.0.4 — 2018-01-28

このAppはApple Watch Appのアイコンを表示するようAppleにより更新されました。

・地図の『災害/噴火』に『草津白根山 火山災害対策図(鏡池周辺)』を追加しました。

### 1.0.3 — 2017-12-13

・細かい使い勝手の修正とバグ修正。

### 1.0.2 — 2017-12-11

・設定に『現在地座標を非表示にする』を追加しました。現在地の座標を表示したくない場合はオンにしてください。地図の表示範囲が広くなります。
・アプリ起動時などにレビューを依頼するようにしました。よろしかったらご協力ください。
・GPSの座標精度によって座標表示の色を変えるようにしました。精度が悪いと赤やオレンジになります。

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## More apps by keiji matsumoto

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- [Geographica \| offline map](https://appshunter.io/ios/app/geographica-offline-map/id887734855)

All apps by keiji matsumoto: https://appshunter.io/developer/354143756

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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 2026-09-06.*