CompassCove Coordinate distance & bearing
AI-generated Estimate great-circle distance and initial true-north bearing between two coordinates, with DMS display.
Screenshots
Screenshots supplied by the seller.
Description
AI generated by Codex for Shai. A local point-to-point coordinate calculator with spherical great-circle distance, miles/nautical-mile conversion, initial true-north bearing diagram, decimal-to-DMS display, point swapping and TXT export.
The hosted demo works in memory only because its sandbox disables storage. Export a JSON backup to retain edits across reloads. The delivered source supports browser-local persistence on a regular static host.
Buyer receives editable source, core tests, documentation, and deployment setup. Private source handover is arranged by the seller; no hosting account or ongoing support is included.
Condition
Development stage: Working prototype (seller-declared)
Seller-declared: provided by the seller, not independently verified by SellMyVibe.
- Solo creator
- Mainly AI-generated
- Under one month in development
- Tests included
- Setup guide included
- Demo available
What works
- Calculate approximate great-circle surface distance between signed decimal coordinates
- Display kilometers, miles, and nautical miles
- Show initial true-north bearing with a compass diagram and cardinal label
- Display both input points as decimal degrees and degrees/minutes/seconds
- Swap point inputs and export a TXT calculation
- JSON backup/import; hosted demo works in memory without network requests
What’s unfinished
- Fixed 6,371 km spherical Earth model, ignoring ellipsoid, terrain, altitude, roads and magnetic declination
- No maps, GPS access, route directions, surveying, or navigation guidance
- Bearing is omitted for coincident/nearly antipodal points and pole starts
- Decimal coordinate input only; DMS is output formatting, not an accepted input syntax
Included assets
Full source code
Documentation
Deployment setup
Test suite
Technologies
HTML5, CSS3, Vanilla JavaScript ES modules, Browser localStorage (standalone source only)
Setup requirements
Unzip source and run python3 -m http.server 8080 in the folder. Open http://localhost:8080 or deploy to a static HTTPS host. No build or API key. Node 20+ runs test.mjs. See README.md and QA.md.
Dependencies and ongoing costs
No third-party libraries, APIs, backend, external fonts, images, or paid subscriptions. Hosted demo is served by SellMyVibe. Standalone source requires a static HTTP/HTTPS host, which may be free within provider limits; paid plans, overages, and custom domains may cost extra.
Known limitations
Working prototype. Fixed 6,371 km spherical Earth model, ignoring ellipsoid, terrain, altitude, roads and magnetic declination. No maps, GPS access, route directions, surveying, or navigation guidance. Bearing is omitted for coincident/nearly antipodal points and pole starts. Decimal coordinate input only; DMS is output formatting, not an accepted input syntax. App data resets on reload in the hosted demo; export JSON backups. See the app description for standalone storage behavior. No independent security audit or broad device/browser certification.
Listings are reviewed for completeness and clarity before publication. Approval is not a guarantee of quality, ownership, security or commercial success. Read the details and ask questions before buying.