C vs Nautical Calculator Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
C
Access up-to-date nautical charts for global exploration and planning. Save points of interest and routes, record tracks, and view marine weather. Upgrade for offline maps, GPS, and advanced features like shaded relief and AIS.
- Free chart viewer
- Autorouting
- Personal waypoints
- Track recording
- Marine weather forecasts
- Offline map downloads
- High-resolution bathymetry
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The C-MAP® App is the perfect companion for recreational boaters and water-lovers. Available on Mobile, Tablet or PC, you’ll always be able to access the most up to date C-MAP charts, wherever in the world you are. With full features, allowing you to explore, plan and save Points of Interest and Routes from wherever you are, the C-MAP App is the perfect aid to navigation for savvy boaters. The C-MAP App Includes: - FREE Chart Viewer - Autorouting™ – find the best route to your favourite places - Personal Waypoints - Track Recording - Thousands of pre-loaded Points of Interest - Marine Weather Forecast - Weather Along the Route - Weather Overlay - Chart Personalisation - Import & Export GPX Files – share your Routes, Tracks or Waypoints with friends - Measure Distance Tool Upgrade to Premium to unlock additional features, including: - Full GPS Functionality - Offline Map Downloads - REVEAL Shaded Relief - High-Resolution Bathymetry - Custom Depth Shading - AIS & C-MAP Traffic Try before you buy… Experience C-MAP App Premium for yourself, with a free 14-day trial (3-day trial in Denmark and Sweden). The C-MAP App updates on a continual basis, ensuring the latest, most up-to-date maps are always at your fingertips. Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. Links to Your Privacy Policy and Terms of Use. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable Privacy Policy: https://www.brunswick.com/dsar Terms of Service https://appchart.c-map.com/tos.html
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.
- Route calculation
- Point on Rhumb Line/Great Circle
- Celestial navigation
- Tidal calculations
- Wind calculation
- Nautical almanac
- World map visualization
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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
Screenshots
Verdict
The clearest difference is price: C at Free against Nautical Calculator Pro's $8.99. C also leads on ratings volume (2.3K vs 3) and chart position (#95 vs unranked). Nautical Calculator Pro's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 11). On update cadence, ads, device support and iOS requirement 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
C is free to download; Nautical Calculator Pro costs $8.99 up front. C sells 10 in-app purchases, starting at $1.99 per month. Nautical Calculator Pro asks for nothing beyond the download.
Nautical Calculator Pro holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: C has 2.3K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 51% of C's written reviews are positive against 60% of Nautical Calculator Pro's.
C ships an update every 6 weeks, Nautical Calculator Pro every 2 months. The most recent releases landed on September 23, 2026 and September 17, 2026 respectively.
| Parameter | C | Nautical Calculator Pro |
|---|---|---|
| Price | Free — better | $8.99 |
| Rating | 4.5 (2.3K ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 51.0% of reviews | 60.0% of reviews — better |
| Number of ratings | 2.3K — better | 3 |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Best chart rank | #95 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 169 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Navico Norway AS | Giacomo Gabriele |
Customer experience
C
Nautical Calculator Pro
Bugs and requests
C
Reported bugs
4 issues- App crashes when trying to save tracks or routes
- Offline maps fail to download or disappear
- Depth/contour data inaccurate or not displaying properly
- Login and authentication issues preventing access
Requested features
4 requests- Add mast height/clearance feature
- Improve AIS integration and functionality
- Allow more customization of map views and data
- Provide better customer support and communication
Nautical Calculator Pro
Not enough reviews yet to summarise bugs or requests.
In-app purchases
C
- Embark Advanced Weather$1.991 Month
- Embark Offline Maps USA$2.491 Month
- Annual Subscription14 Days trial$14.991 Year
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- Annual subscription14 Days trial$14.991 Year
- Region14 Days trial2 variants$18.991 Year
- North America14 Days trial$23.491 Year
- Maps Lakes South East USA14 Days trial$25.991 Year
- Annual Subscription14 Days trial$29.991 Year
- Caribbean14 Days trial$32.991 Year
- Maps USA East Coast & Bahamas14 Days trial$39.991 Year
Nautical Calculator Pro
No in-app purchases









