PRO CHARTS vs Rule Master
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PRO CHARTS
Navigate marine environments with detailed nautical charts and route planning. Track your location, find friends on the water, and share your trip details for safety. Offline chart access ensures reliable navigation even without an internet connection.
- High-resolution NOAA nautical charts
- Offline chart access
- Waypoint and route creation
- Buddy tracking
- Float plan sharing
- Point-and-steer navigation
- Track recording
Read full descriptionHide full description
MiraTrex PRO CHARTS™ is a powerful, yet easy-to-use marine navigation system. Whether you’re a fisherman, weekend cruiser, sailor, diver, jet-skier, or an offshore captain needing to find an exact location hundreds of miles offshore, PRO CHARTS™ will get you there and back home safely – with nothing more than your iPhone or iPad. Key Features: • High-resolution NOAA nautical chart coverage with depths for all U.S. coastal areas, the Great Lakes, major U.S. river systems, and Brazil plus global high-level nautical charts. Charts are automatically updated based on NOAA chart corrections. • Easy one-touch Waypoint and Route creation. Pre-plan your routes at home or create them at sea with equal ease. Just touch the screen to create new waypoints and routes. • Find your friends on the water. With our new Buddy-tracking feature, you can see and meet up with your friends while you’re out on the water. If you’re on your secret spot and don’t want to be seen, you can hide your location with the touch of a button. • Stay safe. Easily create and send a Float Plan of your trip to a friend or family member. Your Float Plan and location history can be forwarded to search and rescue personnel in case of an emergency. • Easy point-and-steer navigation. The red heading bug on the large on-screen compass always directs you to the next point on your route. Navigation is as easy as pointing your boat at the heading bug to stay on course. • No Network. No Problem. PRO CHARTS™ is designed so no internet connection is required to view your charts while out on the water. You simply download in advance any charts you’ll need at sea with the touch of a button. • Record your tracks. Track your position in real-time and later view your track history. • Fully indexed point of interest (POI) database including weather, aids to navigation (markers and lights), obstructions, tides, currents, your buddies, and more. Website: www.miratrex.com -------------------- Plans: Base app with limited features - Free 14 day trial of all premium features - Free All premium features (Monthly) - $2.99 All premium features (Annual) - $29.99 (Save 16%, about 2 months free) -Payment will be charged to your iTunes Account at confirmation of purchase. -Your subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current subscription period. -You will be charged for renewal within 24 hours prior to the end of the current period, for the same duration and at the current subscription rate for that product. -You can manage your subscriptions and turn off auto-renewal by going to your Account Settings in the Apple Settings app after purchase. -No cancellation of the current subscription is allowed during active subscription period. This does not affect your statutory rights. -Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription. -We will be collecting information about your use of the app both when you are online and offline. To find out more please see our privacy policy. -------------------- By purchasing a subscription or downloading an app you agree that you have read and accept our Privacy Policy and Terms of Use. http://www.miratrex.com/procharts/terms-of-use/ http://www.miratrex.com/procharts/privacy/ NOTE: Continued use of GPS running in the background can dramatically decrease battery life. Though PRO CHARTS™ will function without a GPS as a chart reader, a GPS-enabled device is required for point-to-point navigation. Third-party Bluetooth GPS units are available to enable GPS for iOS devices such as WiFi-only iPads that do not include a GPS receiver. For offline use where no Internet connection is available, charts must be pre-cached while still on-line and connected, any charts downloaded while online will be available for offline use.
Rule Master
Master maritime navigation rules with this comprehensive quiz app. It offers extensive question banks, custom filters, and detailed progress tracking for both new and experienced sailors. Generate custom exams and access a digital handbook for efficient learning and exam preparation.
- 10,000+ question-answer combinations
- Custom question filters
- Fill-in-the-blank questions
- Offline capability
- Exam PDF generation
- Digital Navigation Rules handbook
- Progress tracking and statistics
Read full descriptionHide full description
The most advanced, modern, and competitive Rules of the Road quiz application on the iOS App Store! This Navigation Rules quiz application is a must-have for new and experienced sailors, alike. This complete Rules of the Road toolbox is the most effective way to build and maintain proficiency, so you can spend less time preparing for your next USCG Navigation Rules examination. Track your progress like never before, and use our advanced question filters and rule proficiency statistics for efficient, targeted studying. Are you an instructor? Generate and print beautiful, custom-filtered COLREG examinations in seconds with our advanced exam PDF generation algorithm. Are you an experienced mariner? There is always more to learn! Rule Master provides 100+ hand-selected, fill-in-the-blank questions optimized to refine your mastery of the Rules of the Road. Mastery of these verbatim COLREG excerpts allows for intelligent verbal communication of the rules — especially useful for students undergoing rigorous training at the USN Mariner Skills Training Command. - 10,000+ question-answer combinations - Advanced, custom question filters for targeted studying - 100+ hand-selected, fill-in-the-blank questions for experienced Mariners - Full offline capability - Unlimited exam PDF generation and printing - Full, digital Navigation Rules handbook for quick reference - In-depth progress tracking and statistics This COLREG application's abbreviated question bank -- tediously hand-scrubbed and optimized by an experienced USN Surface Warfare Officer -- is coupled with a custom algorithm that generates 10,000+ unique question-answer combinations specifically designed to more effectively teach and examine student knowledge while simultaneously exposing students to the confusing vernacular commonly found in the infamous USCG Rules of the Road question bank.
Screenshots
Verdict
The clearest difference is price: PRO CHARTS at Free against Rule Master's $9.99. PRO CHARTS also leads on ratings volume (8.5K vs 296) and device support (3 vs 1). Rule Master's advantage is in-app purchases (none vs 4) and review sentiment (43% vs 17%). On update cadence, ads, monetization model 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
PRO CHARTS is free to download; Rule Master costs $9.99 up front. PRO CHARTS sells 4 in-app purchases, starting at $2.99 per month. Rule Master asks for nothing beyond the download.
Rule Master holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: PRO CHARTS has 8.5K ratings behind it against 296, so its average is the more settled of the two. Written reviews point the same way: 17% of PRO CHARTS's written reviews are positive against 43% of Rule Master's.
PRO CHARTS ships an update every 2 months, Rule Master every 3 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.
| Parameter | PRO CHARTS | Rule Master |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 4.5 (8.5K ratings) | 4.8 (296 ratings) — better |
| Positive reviews | 17.2% of reviews | 42.9% of reviews — better |
| Number of ratings | 8.5K — better | 296 |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #178 | #55 — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 48 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | MiraTrex, Inc. | Universal Queue LLC |
Customer experience
PRO CHARTS
Rule Master
User reviews
PRO CHARTS
From 8.5K App Store ratingsWhat we love
- 🚀 Great for navigation
- 🗺️ Helpful for coastal areas
- 👍 Useful app overall
Room to improve
- 🐛 Frequent crashes and glitches
- ⚠️ Subscription issues and hidden costs
- 🌐 Lacks coverage for non-US regions
- 🔒 Poor account management and support
Rule Master
From 296 App Store ratingsWhat we love
- 👍 User friendly and easy to navigate
- 📚 Great information for studying and review
- 💯 Helpful for exam preparation and confidence
- ✨ Beautifully designed and functional app
- ✅ Worth a download
Room to improve
- 💰 Free apps are just as good
- 🐛 Questions disappear off the screen
- 🤏 Diagrams are too small to see details
- ❓ Incomplete questions with missing text
- ⚠️ Some answers are not 100% accurate
Bugs and requests
PRO CHARTS
Reported bugs
3 issues- Charts not loading or disappearing
- Subscription not recognized
- Login/account issues
Requested features
3 requests- Offline map downloads
- Depth and hazard data
- Better route planning tools
Rule Master
Reported bugs
5 issues- Questions disappear off the bottom of the screen
- Diagrams are too small to identify vessels
- Some questions have character limits over the margin
- App doesn't display quiz and verbatim in a usable manner
- Incomplete questions showing three dots (...)
Requested features
4 requests- Link relevant COLREG rule when answering correctly and incorrectly
- Expand subjects to include chemistry or history
- Improvements in tracking missed questions for training
- Display full question text when it's cut off
In-app purchases
PRO CHARTS
- 1 Year Auto Renewing Subscription14 Days trial$2.991 Month
- 1 Year Auto Renewing Subscription14 Days trial$29.991 Year
- Brazil - Nautical Charts$4.99
- 1 Year Subscription$29.99
Rule Master
No in-app purchases
Questions
Is PRO CHARTS free?
Is Rule Master free?
Which has better reviews, PRO CHARTS or Rule Master?
Do PRO CHARTS or Rule Master have ads?
Which is updated more often, PRO CHARTS or Rule Master?
Which is more popular, PRO CHARTS or Rule Master?
Other comparisons















