Comparison

Nautical Calculator Preview vs Nautical Rules

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

Head to head
About

Nautical Calculator Preview

This app assists with critical marine navigation tasks, including real-time ship movement, route planning, and advanced sailing calculations. It also provides tools for collision avoidance, maneuvering, and learning maritime regulations and signaling.

Highlights
  • Real-Time Ship Movement
  • Route Planning
  • Mercator & Great Circle Sailing
  • Collision Avoidance
  • Maneuvering Calculations
  • COLREG & Marine Signalization Learning
  • Offline GPS
Features
Read full description

The application to assist in solving the most important marine problems. - For Marine Navigation +Real-Time Ship Movement; +Route Plan; + Mercator Sailing. + Greate Circle Sailing. + Meridional parts. + Plane Sailing. + Traverse Sailing. + Wheel over. + Current and wind sailing. + Allowing for current and wind. + Calculate true wind and apparent wind on a ship running. + Nautical Almanac + Two Lop Fix + Three Lop Fix + Correcting marine sextant altitude of sun and stars. + Probability Distribution Function. + Standard Deviation and Error. + Offline GPS. - For Maneuvering : -Avoid collisions -Change of station in cases: + with time specified + with speed specified + with course specified + Course and speed of another ship. + Closest point of approach(CPA). + Ability to reach another ship going faster. + Close or open to another ship in cases : - as quickly as possible. - on a constant bearing. - with time specified. + Maneuver to intercept a target ship going faster. + Maneuver to intercept ahead a target ship. + Close to another ship as close as possible. +Keep watch for a target ship within a range of distances; +Maneuvering with added calculating of turning. +Bearing and distance to another ship in advance. - For Learning : +International regulations for preventing collisions at sea (COLREG) include Rules; Lights signs; Shapes signs and Sounds signs. + Marine signalizations include Flag signaling; Morse signaling by hand; Morse code. + Maritime buoyage system. + Unit Conversion for Maritime. + Glossary of Marine Navigation. +Maritime Theory. +Global Lighthouses System. author Vu Cong The. vucongthe@gmail.com - Các tính toán hàng hải và vận động tàu, bao gồm : +Dịch chuyển của tàu theo thời gian thật; +Lập kế hoạch hành trình; +Hành trình theo hải đồ Mercator +Hành trình theo cung vòng lớn. +Vĩ độ tiến +Dự tính vị trí tàu một hướng và nhiều hướng. +Tính và đè độ dạt gió dòng. +Tính toán lượn vòng của tàu. +Tính toán gió thực và gió biểu kiến trên tàu đang hành trình. +Lịch thiên văn hàng hải. +Phương pháp hai đường vị trí. +Hiệu chỉnh độ cao mặt trời và sao đo bằng sextant hàng hải. +Tính hàm phân phối xác suất. +Tính sai số chuẩn và độ lệch chuẩn. +Hướng đi, vận tốc của tàu mục tiêu. +Tránh va. +Các thông số ở điểm tiếp cận CPA. +Các thông số trận địa với thời gian hoặc khoảng cách cho trước. + Xác định khả năng tiếp cận tàu mục tiêu có vận tốc lớn hơn. +Thay đổi khoảng cách tới một tàu khác với : - Thời gian ngắn nhất. - Thời gian cho trước. - Phương vị không đổi. +Vận động cắt mũi hoặc lái một tàu mục tiêu có vận tốc lớn hơn. +Vận động cắt mũi một tàu mục tiêu. +Tiếp cận một tàu khác ở cự ly ngắn nhất. +Tính các yếu tố trận địa với thời gian hoặc cự ly cho trước. +Thay đổi trận địa trong các trường hợp: -với thời gian cho trước. -với vận tốc cho trước. -với hướng đi cho trước. +Vận động trong dải khoảng cách. +Tính toán lượn vòng trong vận động. -Tra cứu hàng hải bao gồm : + Qui tắc tránh va quốc tế (COLREG) : Nội dung các điều luật, Tín hiệu đèn, Dấu hiệu, Tín hiệu âm thanh +Thông hiệu hàng hải : Thông tin cờ hiệu, thông tin cờ tay, mã morse +Hệ thống phao tiêu hàng hải +Thuật ngữ Tiếng Anh Hàng hải. +Chuyển đổi đơn vị trong hàng hải. +Lý thuyết hàng hải. +Hệ thống hải đăng toàn cầu. Các giao diện hiển thị hai ngôn ngữ : Tiếng Anh và tiếng Việt Tác giả : Vũ Công Thế. vucongthe@gmail.com

About

Nautical Rules

Master USCG Navigation Rules with a comprehensive question bank and smart study features. Track your progress, practice for exams, and study offline to navigate with confidence.

Highlights
  • 1,200+ practice questions
  • Inland and International waters coverage
  • Detailed explanations
  • Customizable tests
  • Offline study capability
  • Progress tracking dashboard
  • Accuracy by rule statistics
Read full description

Master the USCG Navigation Rules with Nautical Rules – the study companion for boaters, sailors, and maritime professionals preparing for their licensing exams. COMPREHENSIVE QUESTION BANK Practice with 1,225 questions covering the International and Inland Navigation Rules, organized the way the Coast Guard publishes them: • Part A: General • Part B: Steering and Sailing Rules • Part C: Lights and Shapes • Part D: Sound and Light Signals • Part E: Exemptions • Annexes MULTIPLE STUDY MODES • Quick Test: 10, 25, 50, or 100 random questions • Practice by Category: Focus on one Part of the Rules, with the explanation shown after each answer • Practice by Rule: Drill a single rule, such as Rule 13 or Rule 34 SMART PROGRESS TRACKING • Track your overall accuracy and test history • See your accuracy broken down by category and by rule • Focus Area suggestions based on your weakest rule • Daily streak tracking to build a consistent study habit HELPFUL STUDY FEATURES • An explanation for every answer, with the rule it comes from • Diagrams for lights, shapes, and vessel-encounter scenarios • Bookmark difficult questions for later review • Review your incorrect answers after each test • Share your test results as a PDF DESIGNED FOR SUCCESS Whether you're preparing for the USCG Captain's License, recreational boating certification, or just want to refresh your knowledge of the Rules of the Road, Nautical Rules gives you everything you need to study effectively. PRIVACY FOCUSED • No account required • No data collection • Works completely offline • Your progress stays on your device Download Nautical Rules today and navigate your way to exam success! --- Note: This app is an educational study aid and is not affiliated with or endorsed by the U.S. Coast Guard. For official rules and regulations, consult the official USCG Navigation Rules publications.

Screenshots

Nautical Calculator Preview4 screens
Nautical Rules4 screens

Verdict

The call

The clearest difference is ads: Nautical Rules at none against Nautical Calculator Preview's shown. Nautical Rules also leads on ratings volume (12 vs 1) and monetization model (free vs ad-supported). On price, rating, update cadence and in-app purchases 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Nautical Calculator Preview against 5.0 for Nautical Rules. That said, the two scores are not equally well evidenced: Nautical Rules has 12 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Nautical Calculator Preview ships an update every 2 weeks, Nautical Rules every 3 weeks. The most recent releases landed on November 13, 2026 and November 5, 2026 respectively.

Scorecard3 real differences · 7 level
Nautical Calculator Preview versus Nautical Rules: the parameters behind the verdict, then further details
ParameterNautical Calculator PreviewNautical Rules
PriceFreeFree
Rating5.0 (1 ratings)5.0 (12 ratings)
Positive reviews—100.0% of reviews
Number of ratings112 — better
Update frequencyEvery 2 weeks — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size33 MB5 MB
Age rating4+4+
DeveloperThe Vu CongJoseph Kim

Customer experience

Nautical Calculator Preview

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Nautical Rules

All ratings12 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Nautical Calculator Preview

No in-app purchases

None

Nautical Rules

No in-app purchases

Questions

Is Nautical Calculator Preview free?
Nautical Calculator Preview is free to download, with no in-app purchases.
Is Nautical Rules free?
Nautical Rules is free to download, with no in-app purchases.
Which has better reviews, Nautical Calculator Preview or Nautical Rules?
Nautical Calculator Preview and Nautical Rules are both rated 5.0 out of 5 on the App Store, from 1 and 12 ratings respectively.
Do Nautical Calculator Preview or Nautical Rules have ads?
Nautical Calculator Preview shows ads; Nautical Rules does not.
Which is updated more often, Nautical Calculator Preview or Nautical Rules?
Nautical Calculator Preview ships an update every 2 weeks, and Nautical Rules every 3 weeks. Most recently, Nautical Calculator Preview was updated on November 13, 2026 and Nautical Rules on November 5, 2026.

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