App Overview

Bristol Maps icon

Bristol Maps

Chris Hager · Navigation

Bristol Maps is designed specifically for commercial fishermen to navigate using the latest satellite imagery

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.0
14 ratings · Top 30%

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 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.

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

// RORK SYSTEM PROMPT
Rork plan preview for Bristol Maps: 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 offline maps feature for better usability.

Assumption to check: Limited offline functionality

Validate with people who use this workflow before building.

Hypothesis 2

Add real-time traffic overlay for improved navigation.

Assumption to check: Traffic data not available

Validate with people who use this workflow before building.

Hypothesis 3

Integrate TTS voice guidance for turn-by-turn navigation.

Assumption to check: No voice navigation

Validate with people who use this workflow before building.

Hypothesis 4

Offer an ad-free subscription option for better user experience.

Assumption to check: Ads can be intrusive

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

Bristol Maps is designed specifically for commercial fishermen to navigate using the latest satellite imagery. Currently serving Bristol Bay and Copper River watersheds. Say goodbye to outdated maps and inaccurate information - our app utilizes the latest, detailed images for increased efficiency, safer fishing trips, and a higher return on investment. As a fisherman like you, I've always used NOAA charts for the Bay. Given how fast the environment changes, these are at best, unreliable and at worst, dangerous. For this I developed Bristol Maps, an app that leverages curated satellite images taken during low tide, displaying the current bar locations, and allows for multiple images to be layered. For areas with multiple images at varying tides, this app allows you to see where there will, or won’t be navigable water. Additionally, these images can be overlayed onto the traditional NOAA charts. Beyond the core mapping functionality, tide and weather forecasts are also available. Weather can be pinpointed to a location as well as the nearest NOAA zone weather forecast. This information can be combined with the mapping functionality to create digital logs. Location, catch, weather, and tide data can be integrated into a log event. Logs can be overlaid onto the navigation page and analyzed to view catch data by area, gear type (4.75" vs 5"), and weather. Feature list: * Private groups for sharing location, custom routes and waypoints. * Private group chat. * Satellite overlays available for: Naknek/Kvichak, Egegik, Ugashik, Nushagak, and Copper River. Updated seasonally. * NOAA overlays available offline for all of Alaska. * Location grid layouts, organized by color and number, which can replace traditional paper maps or code tables shared by Groups. ie: "I'm over by green 22." A search tool is included to quickly find locations. * NOAA tide charts available offline for Bristol Bay tide stations. Other locations downloaded as they are used. * Pinpoint weather forecasts available as well as NOAA zone weather forecasts. * Boundary lines (with “alarm” functionality), for all major districts are preprogrammed along with the ability to create new boundaries. * Create Waypoints and Routes. These can also be exported/imported to/from other users to share data. * Online maps can be streamed with NOAA charts, custom satellite views, a high-res AK Government view, and street view. * Log entries for recording opener times, district, pictures, sets/deliveries, and automatic tide/weather history. Bristol Maps has been designed with an intuitive, user friendly interface to solve a common fisherman problem. Bristol Maps Pricing $200/Year A one-week free trial is included for testing and includes free cancellation. Subscription includes updates, bug fixes and seasonal imagery additions.

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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
Expo
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@react-native-async-storage/async-storage
BUILD KIT DIFFICULTY
Advanced

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.