App Overview

Marine Rules & Signals icon

Marine Rules & Signals

FB Imray Laurie Norie & Wilson GmbH · Navigation

The reference guide to rules and signals at sea

$5.99 · In-app purchases

PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
2.9
7 ratings · Below Average

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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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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> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for Marine Rules & Signals: 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

Incorporate more multimedia elements like videos and animations to enhance user engagement.

Assumption to check: Limited interactive content and visuals

Validate with people who use this workflow before building.

Hypothesis 2

Redesign the interface with modern aesthetics to improve usability.

Assumption to check: User interface feels outdated

Validate with people who use this workflow before building.

Hypothesis 3

Implement a clearer navigation structure with descriptive labels.

Assumption to check: Navigation can be confusing

Validate with people who use this workflow before building.

Hypothesis 4

Add a user feedback system to gather insights and improve the app.

Assumption to check: Feedback and rating system is lacking

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 reference guide to rules and signals at sea. Part of a series of Marine Navigation apps, Rules & Signals is a useful tool for sailors, fishermen, surfers and people involved in sea water sports. The Imray Marine Navigation reference products are intended for quick reference and learning. Beautifully illustrated with diagrams and short, clear text. Remind yourself quickly about a rule or light, or learn at home, traveling or in the winter while planning your trips. INCLUDES RULES OF THE ROAD: - Steering and sailing rules. - Lights and shapes: day and night time marking of boats. - Sound signals in restricted visibility. Actual sounds. - Distress signals. - Full Colregs text. SIGNALS & COMMUNICATION: - Buoys: worldwide buoyage systems A & B and animated harbour approaches. - Buoy lights, animated. - Sample harbour charts from around the world, with animated lights. - Flags: flag translator, phonetic alphabet, morse code and message builder. - Dual flag messages. - Racing flags. - Semaphore flags. - Radio calls including Mayday/PanPan and radio channels. - Life saving communication including air rescue: Solas V. - Communication with air rescue. LEARNING SYSTEM: - Learning cards for all content, by section or for all Rules together. Content can be scrolled, viewed individually or in sequence. Large images (charts and at a glance images) can be zoomed and panned. Based on the International Regulations for Preventing Collisions and Sea, 1972, with amendments in force from November 1995, SOLAS Chapter V Regulation 29 and the general guidelines for buoys and signals. LANGUAGES English, French, German, Italian, Spanish, Japanese ABOUT US Imray are a leading chart and marine book publishers, based in England and with a catalogue of charts that covers Europe, the Mediterranean and the Caribbean. Imray's pilot books cover the whole world in extensive detail. In partnership with Imray, software developers and sailors. Follow us on Twitter - http://twitter.com/imray_charts Facebook - imraynautical Look out for other applications in the Marine Navigation Series from Imray: TIDES PLANNER - tide predictions any date MARINE CHARTS - Europe Atlantic, Mediterranean, Caribbean, Australia BOAT INSTRUMENTS & AIS (requires WiFI NMEA bridge) CHART SYMBOLS

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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 Navigation
Zustand
Expo
Axios
React Native Paper
BUILD KIT DIFFICULTY
Starter

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.