# Japan Chart Navi vs SEAKER TRACKER

The clearest difference is update cadence: SEAKER TRACKER at every 4 weeks against Japan Chart Navi's every 3 months. Japan Chart Navi's advantage is iOS requirement (6.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Japan Chart Navi sells 10 one-off in-app purchases and SEAKER TRACKER sells 5 in-app purchases, starting at $65.99 per year. Whichever you choose, the download price is not the number that matters.

Japan Chart Navi ships an update every 3 months, SEAKER TRACKER every 4 weeks. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Japan Chart Navi | SEAKER TRACKER |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Monetization | Free | — |
| Size | 42 MB | 33 MB |
| Requires iOS | **6.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [FujiDenshi.Com](https://appshunter.io/developer/352213177) | [HMDT Co., Ltd.](https://appshunter.io/developer/293996377) |

## 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 |


### SEAKER TRACKER

[App page](https://appshunter.io/ios/app/seaker-tracker/id1538676180)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 個人向けプラン | $65.99 | per year |
| ファミリープラン | $189.99 | per year |
| プロフェッショナルプラン | $299.99 | per year |
| ショッププラン | $899.99 | per year |
| SEAKERデバイスの個別追加 | $46.99 | one-time |


## Frequently asked questions

### Is Japan Chart Navi free?

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

### Is SEAKER TRACKER free?

SEAKER TRACKER is free to download, with in-app purchases available.

### Do Japan Chart Navi or SEAKER TRACKER have ads?

Neither Japan Chart Navi nor SEAKER TRACKER shows ads.

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

Japan Chart Navi ships an update every 3 months, and SEAKER TRACKER every 4 weeks. Most recently, Japan Chart Navi was updated on October 8, 2026 and SEAKER TRACKER on October 25, 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.*