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.
App Overview
Marine Chart Symbols
Complete reference for symbols, abbreviations and terms used in marine charts
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.7
3 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 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.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Marine Chart Symbols: 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 an advanced search feature with filters and categories.
Assumption to check: Poor user reviews indicate difficulty in finding symbols.
Validate with people who use this workflow before building.
Hypothesis 2
Provide more detailed descriptions and usage examples.
Assumption to check: Limited information for each symbol.
Validate with people who use this workflow before building.
Hypothesis 3
Adopt a more contemporary UI with better visuals and animations.
Assumption to check: User interface lacks modern design aesthetics.
Validate with people who use this workflow before building.
Hypothesis 4
Add a favorites feature and offline access to symbol details.
Assumption to check: No favorites management or offline access.
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
Complete reference for symbols, abbreviations and terms used in marine charts. Useful as an aid for teaching and learning, or as reminder for experienced sailors and sea cartography users. INCLUDES - Comprehensive coverage: more than 800 symbols and abbreviations. - Full content tree, organised for ease of use. - Index and grouped index for all entries. - Search facility. - Sample chart with visual popups for commonly used symbols. - Favourites: archive your best symbols. - Multi-language within the app (English/French). Full international standard from the IHO.All topics from the IHO, UKHO, SHOM, NOAA, CHS and other hydrographic offices: position, distance, direction, compass, features, landmarks, ports, tides, currents, seabed, rocks, wrecks, obstructions, offshore, tracks, routes, areas, limits, lights, buoys, beacons, fog, radar, radio, services, small craft. LANGUAGES English, French, German, Italian, Spanish ABOUT US Imray are a leading chart and marine book publishers, based in England and with a catalogue of charts for 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 RULES & SIGNALS- Rule of the Road, signals at sea. RACING RULES - RYA Handy Guide to rules for sailing races
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
React Navigation
Axios
React Native Gesture Handler
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.
