App Overview

UTM Grid Ref Compass icon

UTM Grid Ref Compass

Mike Irving · Navigation

Find out your current location on the Universal Transverse Mercator (UTM) geographic coordinate system

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.1
17 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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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.

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 UTM Grid Ref Compass: 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 and caching for better usability.

Assumption to check: Limited offline functionality

Validate with people who use this workflow before building.

Hypothesis 2

Enhance location accuracy with better algorithms or user feedback.

Assumption to check: Inaccurate location in dense areas

Validate with people who use this workflow before building.

Hypothesis 3

Improve UI/UX for a more modern feel.

Assumption to check: Basic UI design

Validate with people who use this workflow before building.

Hypothesis 4

Add features for route planning and navigation.

Assumption to check: Lack of advanced features (like routing)

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

Find out your current location on the Universal Transverse Mercator (UTM) geographic coordinate system. This app will provide you with your current UTM Grid Ref, along with a Compass Bearing, WGS84 Latitude and Longitude values, and an indication of the current Hemisphere. An indication of the Device GPS readings will also be shown. Includes a handy graphical guide to the United States UTM Zones. This app will work worldwide, whereve UTM Data is required. Ideal for outdoor activities, walking, climbing etc. Remember to always carry a map and physical compass in addition to your iPhone. For the best accuracy, use in an open space, away from trees or hill edges. Like a traditional compass, use with the phone in a flat position, not upright. When continued usage is required, you can set the iPhone Screen to stay on indefinitely, from the Settings tab. Send or Share your location information in a Text Message (or iMessage), Email or Tweet* This app requires Location Services to be enabled in your iPhone, and you must grant permission to the app to use these. Compatible with iPhone. Not compatible with iPod Touch, or (non-cellular) iPads, due to the lack of GPS and Compass hardware. * - Internet Connection, and correctly configured Text Message (or iMessage), Email and / or Twitter settings, required to fulfil.

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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
React Navigation
React Native Maps
Zustand
Expo Location
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.