# Japan Chart Navi vs Aisea PRO

The clearest difference is in-app purchases: Aisea PRO at none against Japan Chart Navi's 10. Aisea PRO also leads on update cadence (every 6 weeks vs every 3 months). Japan Chart Navi's advantage is iOS requirement (6.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Japan Chart Navi sells 10 one-off in-app purchases. Aisea PRO asks for nothing beyond the download.

Japan Chart Navi ships an update every 3 months, Aisea PRO every 6 weeks. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Japan Chart Navi | Aisea PRO |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | 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 PRO

[App page](https://appshunter.io/ios/app/aisea-pro/id1478084718)

**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 PRO free?

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

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

Neither Japan Chart Navi nor Aisea PRO shows ads.

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

Japan Chart Navi ships an update every 3 months, and Aisea PRO every 6 weeks. Most recently, Japan Chart Navi was updated on October 8, 2026 and Aisea PRO on October 7, 2026.

---

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