# Japan Chart Navi vs Aisea

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.

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.

## The numbers

| Metric | Japan Chart Navi | Aisea |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (4 ratings)](https://appshunter.io/ios/app/japan-chart-navi/id370079066/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **66.7% of reviews** | 14.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 42 MB | 86 MB |
| Requires iOS | **6.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [FujiDenshi.Com](https://appshunter.io/developer/352213177) | [Aidea Inc.](https://appshunter.io/developer/1454632788) |

## What reviewers say

### Japan Chart Navi

[App page](https://appshunter.io/ios/app/japan-chart-navi/id370079066)

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.

**Highlights:** GPS-based positioning, Orientation and distance to destination, Nautical chart display, Fuel consumption estimation, Offline map data, Coastal area signal reception

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hokkaido Simple Map | $0.99 | one-time |
| Izu Ogasawara Simple Map | $0.99 | one-time |
| Kyushu Simple Map | $0.99 | one-time |
| Okinawa Simple Map | $0.99 | one-time |
| All Japan Simple Map Package | $4.99 | one-time |
| TOKYO WAN - OMAE SAKI | $11.99 | one-time |
| NORTHERN PART of OSAKA WAN | $11.99 | one-time |
| URAGA SIODO | $11.99 | one-time |
| NAHA - KERAMA RETTO | $11.99 | one-time |
| East Setouchi Area Package | $54.99 | one-time |


### Aisea

[App page](https://appshunter.io/ios/app/aisea-sailing-support-app/id1454632789)

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.

**Highlights:** AIS vessel tracking and collision alerts, Map editor for reporting hazards, Voyage playback and analysis, Fleet management tools, In-app Push-To-Talk communication

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Japan Chart Navi free?

Japan Chart Navi is free to download, with in-app purchases available.

### Is Aisea free?

Aisea is free to download, with no in-app purchases.

### Do Japan Chart Navi or Aisea have ads?

Neither Japan Chart Navi nor Aisea shows ads.

### Which is updated more often, Japan Chart Navi or Aisea?

Japan Chart Navi ships an update every 3 months, and Aisea every 5 weeks. Most recently, Japan Chart Navi was updated on October 8, 2026 and Aisea on October 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*