Download Map Data
- Go to the 'Map Data' tab, select the map data package you want to download, and tap 'Download'.
- If you're not on Wi-Fi, the app will remind you that mobile data charges may apply; it will only download after you confirm.
- Upon completion, the download will verify file integrity; if the download fails, tap 'Retry' to resume from where it stopped.
- After downloading, tap 'Activate Offline Map'.
- Map data marked 'Free to Download' can be downloaded directly; full-version map data marked as subscription-required requires upgrading to the full version.
- 'Open Web Map Directory' will open the Offline Map Download Page to view all map data packages and license details.
Choose Contour Line Density
| Version | Suitable Scenarios | File Size |
|---|---|---|
| 50m Contour Lines (Lite Version) | General routes, limited phone storage. | Approx. 144 MB |
| 20m Contour Lines (Standard Version) | Balances file size and terrain detail; the top choice for most users. | Approx. 198 MB |
| 10m Contour Lines (High Density Version) | Routes requiring detailed terrain interpretation. | Approx. 294 MB |
50m Contour Lines (Lite Version)
Suitable Scenarios：General routes, limited phone storage.
File Size：Approx. 144 MB
20m Contour Lines (Standard Version)
Suitable Scenarios：Balances file size and terrain detail; the top choice for most users.
File Size：Approx. 198 MB
10m Contour Lines (High Density Version)
Suitable Scenarios：Routes requiring detailed terrain interpretation.
File Size：Approx. 294 MB
Japan Mountain Maps (from 1.1.6)
Aki Map offers offline vector maps of Japan's mountain regions, again with trails, main roads, water, peaks, place names and 20 m contours. Japan is split into 11 regional packs you download separately, so you can install only the regions your trip needs. They need Aki Map 1.1.6 or later; older versions do not show the Japan packs in the Maps tab, so update the App first.
| Pack | Area (approximate) |
|---|---|
| Hokkaido West | Rishiri, Shakotan, Yotei, Komagatake (north, central, south Hokkaido) |
| Hokkaido East | Daisetsuzan, Tokachi, Hidaka, Shiretoko (eastern Hokkaido) |
| Tohoku North | Aomori, Iwate, Akita: Hakkoda, Shirakami, Iwate-san |
| Tohoku South | Miyagi, Yamagata, Fukushima: Zao, Iide, Asahi, Azuma |
| Kanto | Tokyo, Kanagawa, Saitama, Chiba; Fuji-Hakone, Nikko, Oze |
| Chubu North | Niigata, Toyama, Ishikawa, Fukui; northern Nagano and Gifu (Northern Alps) |
| Chubu South | Southern Nagano, Yamanashi, southern Gifu (Central and Southern Alps) |
| Kinki | Mie, Shiga, Kyoto, Osaka; Kii Mountains, Omine, Odaigahara |
| Chugoku | Tottori, Shimane, Okayama, Hiroshima, Yamaguchi; Daisen |
| Shikoku | Kagawa, Tokushima, Ehime, Kochi; Ishizuchi, Tsurugi |
| Kyushu | Fukuoka to Kagoshima; Kuju, Aso, Kirishima, Yakushima |
Hokkaido West
Area (approximate)：Rishiri, Shakotan, Yotei, Komagatake (north, central, south Hokkaido)
Hokkaido East
Area (approximate)：Daisetsuzan, Tokachi, Hidaka, Shiretoko (eastern Hokkaido)
Tohoku North
Area (approximate)：Aomori, Iwate, Akita: Hakkoda, Shirakami, Iwate-san
Tohoku South
Area (approximate)：Miyagi, Yamagata, Fukushima: Zao, Iide, Asahi, Azuma
Kanto
Area (approximate)：Tokyo, Kanagawa, Saitama, Chiba; Fuji-Hakone, Nikko, Oze
Chubu North
Area (approximate)：Niigata, Toyama, Ishikawa, Fukui; northern Nagano and Gifu (Northern Alps)
Chubu South
Area (approximate)：Southern Nagano, Yamanashi, southern Gifu (Central and Southern Alps)
Kinki
Area (approximate)：Mie, Shiga, Kyoto, Osaka; Kii Mountains, Omine, Odaigahara
Chugoku
Area (approximate)：Tottori, Shimane, Okayama, Hiroshima, Yamaguchi; Daisen
Shikoku
Area (approximate)：Kagawa, Tokushima, Ehime, Kochi; Ishizuchi, Tsurugi
Kyushu
Area (approximate)：Fukuoka to Kagoshima; Kuju, Aso, Kirishima, Yakushima
What changes while a Japan map is active
Some features rely on official Taiwan data, so the App adapts to the country of the active map pack: while a Japan pack is active, the following are hidden or change, and they return when you switch back to a Taiwan pack.
- No TWD97 coordinate format, only WGS84, degrees-minutes-seconds and UTM; the TWD97 coordinate grid is shown only for Taiwan packs.
- No weather forecast (the data comes from Taiwan's Central Weather Administration) or route weather; the Trip Brief PDF has no weather.
- No permit reminders, magnetic declination or print area, and no 3D terrain button on the map.
- The emergency numbers quoted on the safety card and trip brief become Japan's 110 (police) and 119 (fire, ambulance).
- Sunrise and sunset use Japan's time zone.
Activate and Deactivate
- Once activated, the map tab will prioritize using that map data; the 'Pre-Departure Check' in the information panel will show 'Offline Map Data: Activated'.
- When you need to switch map data, first 'Deactivate' and then activate another package.
- Saving multiple map data packages simultaneously (for example, different regions) is a full-version feature.
- When a new version is available, the map data card will display 'New version available for update'; tap 'Update' to download. Map data you no longer need can be deleted by tapping 'Delete' to free up space.
- Alerts on the map: when the active map data has a newer version, a blue badge "Offline map update available — tap to update" appears on the map and takes you to the Map Data tab; if the map file is damaged, "Offline map file is invalid; showing online map instead" appears with a "Re-download" button.
- When the search index is missing, the search screen offers "Update Offline Map". If you see "This app version is too old to use the latest map packs", update the app from the App Store first.
- New map data notice: at launch and when the app returns to the foreground it checks the map catalog in the background (skipped offline). When there is a new pack, the Map Data tab icon shows a red number; after you open the tab the number clears, and unseen new packs carry a red "New" tag until you leave the tab. A newer version of a pack you already downloaded counts too, once per version. The app sends no push notifications.
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