NavCalc Dynamic vs RadarTools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NavCalc Dynamic
This app calculates the course and speed needed to counteract current and wind effects for navigation. It visually displays these calculations on a compass rose, dynamically updating as parameters change. Useful for learning and solving real-world sailing problems.
- 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
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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.
RadarTools
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The presence sensor is connected via Bluetooth, open the APP to make the presence sensor output time and execution conditions settings, the APP interface is simple and the settings are easy to understand.
Screenshots
Verdict
The clearest difference is update cadence: NavCalc Dynamic at every 6 days against RadarTools's every 5 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
NavCalc Dynamic ships an update every 6 days, RadarTools every 5 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | NavCalc Dynamic | RadarTools |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 6 days — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 15 MB | 10 MB |
| Age rating | 4+ | 17+ |
| Developer | Richard Craddock | 深圳市海凌科电子有限公司 |
In-app purchases
NavCalc Dynamic
No in-app purchases
RadarTools
No in-app purchases
Questions
Is NavCalc Dynamic free?
Is RadarTools free?
Do NavCalc Dynamic or RadarTools have ads?
Which is updated more often, NavCalc Dynamic or RadarTools?
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