# Nautical Calculator Pro vs EGK BTSkyTrain Map

The clearest difference is price: EGK BTSkyTrain Map at Free against Nautical Calculator Pro's $8.99. EGK BTSkyTrain Map also leads on update cadence (every 3 weeks vs every 2 months). Nautical Calculator Pro's advantage is iOS requirement (15.0 vs 18.5). On ads, in-app purchases and device support there is nothing between them.

EGK BTSkyTrain Map is free to download; Nautical Calculator Pro costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Nautical Calculator Pro ships an update every 2 months, EGK BTSkyTrain Map every 3 weeks. The most recent releases landed on September 17, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Nautical Calculator Pro | EGK BTSkyTrain Map |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/nautical-calculator-pro/id1455851003/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 27 MB | 5 MB |
| Requires iOS | **15.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Giacomo Gabriele](https://appshunter.io/developer/1455745031) | [Isaac Eng Gian Khor](https://appshunter.io/developer/1808933315) |

## What reviewers say

### Nautical Calculator Pro

[App page](https://appshunter.io/ios/app/nautical-calculator-pro/id1455851003)

This app provides comprehensive tools for solving complex nautical navigation calculations, including route planning, celestial navigation, and tidal predictions. It features a world map for route visualization and offline functionality for map display.

**Highlights:** Route calculation, Point on Rhumb Line/Great Circle, Celestial navigation, Tidal calculations, Wind calculation, Nautical almanac, World map visualization

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

**In-app purchases:** none


### EGK BTSkyTrain Map

[App page](https://appshunter.io/ios/app/egk-btskytrain-map/id6751541889)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Nautical Calculator Pro free?

Nautical Calculator Pro costs $8.99, with no in-app purchases.

### Is EGK BTSkyTrain Map free?

EGK BTSkyTrain Map is free to download, with no in-app purchases.

### Do Nautical Calculator Pro or EGK BTSkyTrain Map have ads?

Neither Nautical Calculator Pro nor EGK BTSkyTrain Map shows ads.

### Which is updated more often, Nautical Calculator Pro or EGK BTSkyTrain Map?

Nautical Calculator Pro ships an update every 2 months, and EGK BTSkyTrain Map every 3 weeks. Most recently, Nautical Calculator Pro was updated on September 17, 2026 and EGK BTSkyTrain Map on September 13, 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.*