Comparison

Nautical Calculator Pro vs COLREG

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Nautical Calculator Pro

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
Read full description

Nautical Calculator Pro is the most complete application that solves the navigation calculations The main features are : - Calculate Route (solves 2nd navigation problem) - Calculate point on Rhumb Line (solves 1st navigation problem) - Calculate point on Great Circle (solves 1st navigation problem) - Calculate point on WGS84 (solves 1st navigation problem) - Calculate Average speed - E.T.A. calculation - Route plan, for manual waypoints planning - Waypoint route - Compisite sailing with parallel limit - Rhumb Line Parallel/Meridian intersection - Follow on same Rhumb Line route - Opposite course rendez vous - Route correction - Calculate Amplitude at sunset and sunrise and magnetic compass deviation - Compass detections - Solves Drift problem - Solves Tides problem - Solves Tidal current problem - Wind calculation with Beaufort classification - ABC Tables (azimuth, initial course, right ascension with unknow star) - Nautical almanac - Celestial Navigation with position line - Meridian transit - Celestial observation - Coastal navigation - Wheel Over - Draft survey - Converter - Anchorage - Interpolation In routes feature there is a world map: it isn't a nautical chart and is not for use as a saling chart, but as a simple general means of showing the courses through the water on earth, this map isn't for navigational purposes. No need connection for show the map; the map will be downloaded only one time. The map, for size limit, will be show for scale over 60-70 Nm. follow on facebook https://www.facebook.com/NauticalCalculator

About

COLREG

Master maritime navigation with this comprehensive guide to the International Regulations for Preventing Collisions at Sea. Learn about ship lights, day shapes, sound signals, and access the full COLREGs for safe sailing.

Highlights
  • Ship lights guide
  • Day shapes meanings
  • Sound signals library
  • Complete COLREGs access
  • Flashcards for study
Features
Read full description

Introducing the Ultimate COLREG App - Your All-in-One Guide to Safe Navigation! Set sail with confidence and master the rules of the sea like never before with our comprehensive COLREG App, now available on the App Store. Whether you're a seasoned mariner or a maritime enthusiast, this app is your essential companion for understanding and applying the International Regulations for Preventing Collisions at Sea (COLREGs). • Ship Lights: Navigate the darkness with ease! Our app provides a detailed guide to ship lights, helping you identify vessels and their activities based on their unique light configurations. • Daily Shapes: Decode maritime signals effortlessly! Learn about the various day shapes and their meanings, ensuring you're always prepared to interpret the intentions of other vessels. • Sound Signals: Understand the language of the sea! Explore a comprehensive library of sound signals, so you can effectively communicate with other vessels and enhance safety on the water. • Rules: Dive deep into the COLREGs! Access the complete set of regulations, organized for easy reference, to ensure you're always aware of your rights and responsibilities at sea. • Flash Cards: Study on the go! Our flashcards make learning COLREGs a breeze. Test your knowledge and reinforce your understanding wherever you are. Master the art of safe navigation and enjoy peace of mind on the open water with our COLREG App. It's the ideal companion for both novice and experienced sailors, helping you stay compliant and avoid collisions. Don't leave your safety to chance – download our COLREG App today and gain the knowledge you need to sail with confidence. Make the smart choice for safe navigation and get started now! Smooth sailing is just a download away. Get our COLREG App from the App Store today and embark on a journey to safer, smarter, and more enjoyable boating experiences.

Screenshots

Nautical Calculator Pro4 screens
COLREG4 screens

Verdict

The call

The clearest difference is review sentiment: Nautical Calculator Pro at 60% against COLREG's 0%. Nautical Calculator Pro also leads on update cadence (every 2 months vs every 7 months). COLREG's advantage is price ($0.99 vs $8.99) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases, monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Nautical Calculator Pro costs $8.99 and COLREG $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Nautical Calculator Pro ships an update every 2 months, COLREG every 7 months. The most recent releases landed on September 17, 2026 and September 15, 2026 respectively.

Scorecard4 real differences · 6 level
Nautical Calculator Pro versus COLREG: the parameters behind the verdict, then further details
ParameterNautical Calculator ProCOLREG
Price$8.99$0.99 — better
Rating5.0 (3 ratings) — better—
Positive reviews60.0% of reviews — better0.0% of reviews
Number of ratings3 — better—
Update frequencyEvery 2 months — betterEvery 7 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size27 MB133 MB
Age rating4+4+
DeveloperGiacomo GabrieleOleksandr Kuzmychov

Customer experience

Nautical Calculator Pro

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive60.0%
Neutral20.0%
Negative20.0%

COLREG

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Nautical Calculator Pro

No in-app purchases

None

COLREG

No in-app purchases

Questions

Is Nautical Calculator Pro free?
Nautical Calculator Pro costs $8.99, with no in-app purchases.
Is COLREG free?
COLREG costs $0.99, with no in-app purchases.
Do Nautical Calculator Pro or COLREG have ads?
Neither Nautical Calculator Pro nor COLREG shows ads.
Which is updated more often, Nautical Calculator Pro or COLREG?
Nautical Calculator Pro ships an update every 2 months, and COLREG every 7 months. Most recently, Nautical Calculator Pro was updated on September 17, 2026 and COLREG on September 15, 2026.

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