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
Lake Champlain – Boating Map
THE ALL NEW ADVANCED MARINE RASTER NAUTICAL CHARTS APP FOR BOATERS, ANGLERS, KAYAKERS, CANOERS, FISHERMEN, WATER NAVIGATORS AND SAILORS!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 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 Lake Champlain – Boating Map: 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
Efficient offline maps with small download size
Assumption to check: Uses too much data
Validate with people who use this workflow before building.
Hypothesis 2
Clear lane guidance and landmark references
Assumption to check: Voice directions unclear
Validate with people who use this workflow before building.
Hypothesis 3
Instant rerouting with traffic updates
Assumption to check: Slow route recalculation
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 ALL NEW ADVANCED MARINE RASTER NAUTICAL CHARTS APP FOR BOATERS, ANGLERS, KAYAKERS, CANOERS, FISHERMEN, WATER NAVIGATORS AND SAILORS! IPHONE, IPHONE X & IPAD PRO COMPATIBLE! NO WAITING TIME FOR NAUTICAL CHART DOWNLOADS. IT'S READY TO USE! COMBINATION OF SMALL CRAFT AND HARBOR CHARTS FOR EASY NAVIGATION. ALL CHARTS OVERLAY IS ARRANGED IN A SEAMLESS ORDER, BASED ON CHART SCALE AND PRIORITY. NO NEED TO CHANGE CHARTS MANUALLY, THEY ARE READY FOR CONTINUOUS NAVIGATION. CHART FEATURES: ALL MARINE RASTER NAUTICAL CHARTS ARE FROM NOAA SOURCES. ALL CHARTS ALIGNED WITH ORIGINAL CHART CO-ORDINATES, ARE ACCURATE FOR USE. NEW MAPS FOR OFFLINE CHART OVERLAY DISPLAY, USE THEM AS LONG AS YOU BOAT. HIDE / SHOW ALL CHART BOUNDARIES. CHART BOUNDARIES FOR EACH INSET OR SUB CHARTS ARE VISIBLE. CHART TRANSPARENCY ADJUSTMENT TO COMPARE WITH ARIEL AND STREET MAPS. FAVORITE MARKER: INSERT UNLIMITED FAVORITE MARKERS ON MAP. PHOTO TAGGED FACILITY FOR MARKERS WITH EMAIL OPTION. ADD MULTIPLE PHOTOS TO FAVORITE MARKERS (MAX 3 ALLOWED). EMAIL FAVORITE MARKERS AS KMZ FILE. UPDATED FEATURES: TRACK YOUR LOCATION WITH GPS ON MAP. MEASURE LIVE DISTANCE ON CHART OVERLAY. LONG-PRESS ON MAP TO KNOW THAT POINT CO-ODINATE & CLOSE. MAP DIRECTIONS: FIND REAL-TIME DRIVING DIRECTIONS (LAND BASE ONLY). GET DISTANCE, TIME DURATION & STEP BY STEP DRIVING INSTRUCTIONS. DIRECTION INFORMATION BUTTON WILL APPEAR UNDER DIRECTION BUTTON ONCE ROUTE IS SHOWN ON MAP. CLICK IT FOR DETAILS. INDIVIDUAL ROUTE STEP IS VISIBLE IN DIFFERENT COLOR WHEN DIRECTION STEP DETAILS ARE CLICKED. THIS FEATURE WORKS ON NETWORK CONNECTIVITY. MAP SEARCH: SEARCH NEARBY POINT OF INTERESTS OF YOUR REQUIREMENT. USER EXACT KEYWORDS FOR FAST RESULTS. ONLY TOP RESULTS ARE SHOWN BASED ON AVAILABILITY. THIS FEATURE WORKS ON NETWORK CONNECTIVITY. SETTINGS: HIDE / SHOW CHART BOUNDS. HIDE / SHOW CHART DISPLAY (TRANSPARENCY ONLY). MANAGE MAP DISTANCE & DIRECTION UNITS. MAP TYPE DISPLAY UPDATION. HIDE / SHOW MARKERS WHENEVER REQUIRED. RUN-TIME SETTING CHANGES WILL NOT APPLY INSTANTLY FOR DIRECTIONS AND MAP DISTANCE MEASUREMENT. THIS APP IS MOST ADVANCED WITH ALL THE NECESSARY TOOLS FOR EASY NAVIGATION ON WATER. CONTINUOUS CHARTS DISPLAY MAKES IT MORE EASIER FOR SAILING AND AS THERE WILL BE NO INTERNET WHILE SAILING, THE OFFLINE CHART MODE IS FASTER FOR NAVIGATION. NOTE 1: All charts are Geo-positioned to match the exact location of features displayed on charts but there may be some difference between the positions of actual objects that are in the water or sea and charts because of the different chart scales. Disclaimer: The offline Raster Nautical Charts data provided in all charts is from NOAA and is for reference purposes only and not for navigation. We are experts in GIS & IOS Apps development and strive to provide the best products to the customers. Any suggestions from the users of this product are welcome to make the app more useful. HAPPY BOATING AND SAILING VOYAGES ALL THE TIME!
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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 Native
Mapbox
Expo Location
RevenueCat
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.
