App Overview

NavRules icon

NavRules

Mintaka Innovations · Navigation

The best way to learn the Nautical Rules of the Road.

$15.99 · In-app purchases

PRICE
$15.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
3.8
18 ratings · Top 50%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for NavRules: map the core Navigation workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Implement a community feature for user-generated content.

Assumption to check: Limited content updates and user engagement

Validate with people who use this workflow before building.

Hypothesis 2

Introduce a freemium model with limited access to rules.

Assumption to check: High initial cost deters users

Validate with people who use this workflow before building.

Hypothesis 3

Optimize app performance and load times.

Assumption to check: Navigation and search can be slow

Validate with people who use this workflow before building.

Hypothesis 4

Enhance quizzes with interactive features and immediate feedback.

Assumption to check: Quiz functionality is basic

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

The best way to learn the Nautical Rules of the Road. NavRules provides all the questions, answers, explanations and resources to help you master the Nautical Rules of the road. For all mariners, from kayakers to ship captains. Product Description: Based on the International and US Inland Navigation Rules along with the published edition of the USCG database of license exam questions, this App helps you master the Navigation Rules using a practice exam driven methodology. Using NavRules you generate practice exams where you: • control the number of questions, • control the scope of the questions (international vs inland), • specify a filter (a text string that must appear in the question), • specify the rule the questions pertain to, • identify whether the question has been previously answered or not, or answered incorrectly or not. This gives you control over the tests that are generated so you can focus your learning experience. After taking an exam you can review the results to see: • which questions were answered correctly, • for incorrect answers the correct answer, • the rule the question pertains to so you can understand the context of the question. Every practice exam you take tracks your results relative the the Navigation Rules Question Pool. By browsing the Question Pool you can see your progress on understanding each rule. For each rule NavRules reposts: • your coverage (number of questions you have answered) and, • your proficiency (the percentage of questions you have answered correctly). If you want to study a rule you can link directly to the questions related to that rule and choose the answers. In this "review" mode you get immediate feedback on whether your answer is correct (but these results are not recorded and do not impact your rule coverage or proficiency). The Flash Card mode lets you see all the diagrams used in the tests and from each of them see the questions that reference that diagram. The included Rule Book provides: • index to US Inland, International and Canadian Rules, • link to all illustrations used in the Navigation Rules, • link to all vessel lights by vessel type, • definitions, • demarcation lines, • special terminology, • distress signals • references. Other features include: • over 1200 answered and referenced questions on the Navigation Rules, • complete copy of the Navigation Rules, • custom design your practice tests by number, filter, and type so you can focus on what you need to learn, • rules are clearly identified as Inland and International or both, • all practice tests results are stored until manually deleted, • Canadian Modifications to the Navigation Rules.

Written user reviews are not shown here. Check current App Store reviews >

Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
Redux
Axios
React Navigation
Shadcn/UI
BUILD KIT DIFFICULTY
Intermediate

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.