App Overview

SWO Radian Rule icon

SWO Radian Rule

Corey McCollum · Navigation

Are you the Conning Officer assigned to make the approach for an UNREP? Do you struggle doing "public math" with the radian rule, especially under pressure? Have you been relying upon a paper cheat sheet and wish you ...

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
2 ratings · Top 5%

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 SWO Radian Rule: 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

Include more measurement tools and options.

Assumption to check: Limited features for advanced navigation.

Validate with people who use this workflow before building.

Hypothesis 2

Implement offline capability for distance calculations.

Assumption to check: No offline functionality.

Validate with people who use this workflow before building.

Hypothesis 3

Allow users to customize settings for measurements.

Assumption to check: Lack of user customization options.

Validate with people who use this workflow before building.

Hypothesis 4

Integrate with GPS and mapping services for enhanced accuracy.

Assumption to check: Limited integration with navigation systems.

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

Are you the Conning Officer assigned to make the approach for an UNREP? Do you struggle doing "public math" with the radian rule, especially under pressure? Have you been relying upon a paper cheat sheet and wish you had an app to automate the radian rule and provide you instant results? Then SWO Radian Rule is the answer to your prayers! Designed from the ground up with the Conning Officer in mind, SWO Radian Rule provides an intuitive, user-friendly interface that clearly displays all of the critical information you need at a glance. Simply dial-in the appropriate Degrees Offset and Range to Guide, and SWO Radian Rule will do the rest, instantly calculating estimated Separation Alongside, target Degrees Offset, and your target Bearing to Guide. SWO Radian Rule allows you to select on which side of your ship the Guide will be (PORT or STBD), R Corpen, and target Separation Alongside. And, SWO Radian Rule is compatible with Darken Ship requirements, just in case you're conducting a night time UNREP. Whether you're a brand new Ensign or a salty ol' Senior Officer, SWO Radian Rule is an invaluable tool that you'll wish you had sooner. Make a seamless approach on the Guide every time with the help of SWO Radian Rule!

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 Navigation
Expo Constants
React Native Reanimated
Zustand
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.