# NavCalc Dynamic — a Navigation Calculator

> Navigation calculator for course to steer and speed over ground with current and leeway. (iPhone/iPad app by Richard Craddock.)

- Source: https://appshunter.io/ios/app/navcalc-dynamic/id1638841716 (this page in markdown: same URL + `.md`)
- Developer: [Richard Craddock](https://appshunter.io/developer/1579756955)
- Category: Utilities, Navigation
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 13.0 · 15 MB
- Languages: English
- Released: 2022-08-19
- Data updated: 2026-06-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/navcalc-dynamic/id1638841716/reviews.md

## What is NavCalc Dynamic?

NavCalc is a simple navigation calculator. Given a desired heading, boat speed, and the set and drift of current, NavCalc will display the Course to Steer (CtS) and Speed over Ground (SoG) that will be achieved on that course given the current.

NavCalc draws a neat little picture of the heading, current vector, and course to steer on a 360º compass rose which includes both degrees True and Magnetic (if you enter a Magnetic Variation). NavCalc also allows you to enter degrees of leeway and wind direction, and will take leeway into account when calculating the CtS.

NavCalc will dynamically update the drawing as you change any of the parameters (heading, boat speed, current set or drift, variation).

NavCalc can be used to solve navigation problems like the ones you might find on the tests for Coastal Navigation courses from US Sailing or ASA. It’s also useful for building intuition about how current affects your boat’s course and speed over ground (or velocity made good) since it updates dynamically as you change any parameter.

## Key features

- Calculate Course to Steer (CtS)
- Calculate Speed over Ground (SoG)
- Visual compass rose display
- Dynamic parameter updates
- Magnetic variation input
- Leeway and wind direction input


## Frequently asked questions about NavCalc Dynamic

### What is NavCalc Dynamic?

NavCalc Dynamic is a free navigation calculator that helps users determine the correct course and speed to steer their vessel, accounting for current and wind. It provides a visual representation of these calculations on a compass rose.

### How does NavCalc Dynamic handle magnetic variation?

You can enter the magnetic variation into NavCalc Dynamic, and it will display both True and Magnetic degrees on its compass rose. This ensures accurate readings for your navigation.

### Can NavCalc Dynamic account for leeway?

Yes, NavCalc Dynamic allows you to input degrees of leeway and wind direction. It will then factor these into its calculations for the Course to Steer (CtS).

### How often is NavCalc Dynamic updated?

The latest version of NavCalc Dynamic is 1.1.8, and it was last updated on September 2, 2023. Updates typically address bug fixes and performance improvements.

### What devices support NavCalc Dynamic?

NavCalc Dynamic is available for iPhone, iPad, and iPod. It is designed for iOS devices.

### What is the age rating for NavCalc Dynamic?

NavCalc Dynamic has an age rating of 4+. This indicates it is suitable for users of all ages.

### Is NavCalc Dynamic useful for learning navigation?

Yes, NavCalc Dynamic is useful for building intuition about how current affects a boat's course and speed. Its dynamic updates as parameters change make it a great learning tool, similar to problems found in US Sailing or ASA courses.

### Does NavCalc Dynamic have ads?

No, NavCalc Dynamic does not contain advertisements. It is a completely ad-free application.

## Version history (last 5 releases)

### 1.1.8 — 2023-09-02

New icon, updated libraries.

### 1.1.6 — 2022-09-01

Fixed UI bugs

### 1.1.5 — 2022-08-26

Cleaned up Compass UI

### 1.1.3 — 2022-08-20

Fixed bug:
Keyboard can now be dismissed by touching the plot area.

### 1.1.2 — 2022-08-19

No release notes.

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## More apps by Richard Craddock

- [Plan Your Sail](https://appshunter.io/ios/app/plan-your-sail/id1579756953)
- [ParaChord](https://appshunter.io/ios/app/parachord/id6449880245)
- [Star Pupil](https://appshunter.io/ios/app/star-pupil/id6463496579)

All apps by Richard Craddock: https://appshunter.io/developer/1579756955

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*