Japan Chart Navi vs Aisea
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Japan Chart Navi
This marine navigation app uses GPS to display your current position, orientation, and distance to your destination. It provides access to nautical charts and helps estimate fuel consumption for small boats, even in areas with limited radio signal.
- GPS-based positioning
- Orientation and distance to destination
- Nautical chart display
- Fuel consumption estimation
- Offline map data
- Coastal area signal reception
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*********************** This is a free version for tests. Please try this before you purchase the paid version. AppStore search screen "map of the sea" to search on other series will be displayed. All 45 will be commercialized by Japan in the Y map charts a single unit. Please wait for a while. *********************** (To use a lot of memory, iPhone3GS is officially supported or more) "The iPhone in the sea!" We developed this product based on this slogan. "Navigation map of the sea" is, GPS measured at sea using the current position, orientation to the destination, distance, and for marine navigation applications use to measure the approximate fuel. Even out of radio at sea, map (Y chart), so in the application has data to confirm the orientation can determine the current location and destination. Jet ski (Jet Marine), and motorboats as, GPS was not designed for use with small boats. iPhone waterproof pack (sold separately) into, the sea is also please phone us. Pick up a signal in coastal areas of Mobile, GPS to locate the precise, you can also request a quick rescue. It also features fuel and easy calculation, you can drift by as much as possible to prevent gas. (Thank you for such use to reference only) This app, like the Coast Guard Authorization "number of 222 505 Coast Guard permit" (based on publications like Business Law Article 25 water) has received. Partnership with Japan Hydrographic Association also like the latest "for example - motorboat yacht (Y Chart)" is used. The information is displayed to confirm the position of own ship. For more information about the time of sailing, please use the chart. Datum is used in this figure, "Datum world." "Map of the Sea Navigation (Select 1)" There are 45 in all. Check the map, like the site Hydrographic Association, "Internet shopping chart" Please confirm. "For example - yacht and motorboat (Y Chart)" You can see a map of the 45 items. The paper map also "Internet shopping chart" I have sold, according Please utilize. All content and maps please reference purposes only. Regarding the accident using this app, we can not assume any responsibility. GPS in commercial vessels is common in the leisure boat or jet ski facilities are still not common. The accidents in Japan, I really wish to reduce a little.
Aisea
This navigation app enhances maritime safety by displaying nearby vessel movements and potential collision risks. It also allows users to report hazards, review past voyages, and manage fleets. Communicate with nearby users directly through the app.
- AIS vessel tracking and collision alerts
- Map editor for reporting hazards
- Voyage playback and analysis
- Fleet management tools
- In-app Push-To-Talk communication
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◦ Radar mode Aisea App's Radar mode displays the movement of vessels in the vicinity equipped with AIS or using the App on a scalable chart. When it detects a risk of collision, the App will warn you minutes ahead. Aisea brings you peace of mind on the sea. ◦ Map editor and reporting tool Users can report dangerous floating objects from Aisea App, and Map Editors with business accounts can set various areas that require the nearby sailors' attention. Those reported markers may be public and visible on the chart for others or private and hidden. ◦ Voyage playback Playback the past voyages on the web anytime with videos and other voyage data since Aisea automatically saves them as your vessels navigate. These playbacks help investigate in case of accidents and are useful for optimizing navigation courses. ◦ Fleet management The Fleet Management interface is available for affordable Business accounts, letting you keep tabs on your fleet, clues, operators, and anyone you need to communicate for your everyday tasks. You and your operators can access the interface from your PC, smart device from anywhere anytime. ◦ Vessel tracking Aisea monitors vessel locations through Aisea App and AIS stations on the shore and ships. Vessels will be appropriately represented by vessel-shaped icons in scale rather than dots or triangles so that you can grasp the situation intuitively. ◦ In App Push-To-Talk Communicate with nearby users without radio equipment. UX is carefully designed to resemble the Marine VHF radio with plenty of guidance, so the learning curve will be shallow for everyone. Business users can talk within their business or projects.
Screenshots
Verdict
The clearest difference is review sentiment: Japan Chart Navi at 67% against Aisea's 14%. Japan Chart Navi also leads on iOS requirement (6.0 vs 15.6). Aisea's advantage is in-app purchases (none vs 10) and update cadence (every 5 weeks vs every 3 months). On price, ads, monetization model and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Japan Chart Navi sells 10 one-off in-app purchases. Aisea asks for nothing beyond the download.
Japan Chart Navi ships an update every 3 months, Aisea every 5 weeks. The most recent releases landed on October 8, 2026 and October 15, 2026 respectively.
| Parameter | Japan Chart Navi | Aisea |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (4 ratings) — better | — |
| Positive reviews | 66.7% of reviews — better | 14.3% of reviews |
| Number of ratings | 4 — better | — |
| Update frequency | Every 3 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 6.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 42 MB | 86 MB |
| Age rating | 4+ | 4+ |
| Developer | FujiDenshi.Com | Aidea Inc. |
Customer experience
Japan Chart Navi
Aisea
In-app purchases
Japan Chart Navi
- Hokkaido Simple Map$0.99
- Izu Ogasawara Simple Map$0.99
- Kyushu Simple Map$0.99
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- Okinawa Simple Map$0.99
- All Japan Simple Map Package$4.99
- TOKYO WAN - OMAE SAKI$11.99
- NORTHERN PART of OSAKA WAN$11.99
- URAGA SIODO$11.99
- NAHA - KERAMA RETTO$11.99
- East Setouchi Area Package$54.99
Aisea
No in-app purchases









