GEO Calc vs Compass Triangulation

GEO Calc : Coordinates is a WGS84 field calculator for surveyors, engineers, and outdoor professionals. Convert coordinates, compute geodesic distance and bearing, measure on a map, and manage waypoints—on iPhone and iPad. COORDINATE CONVERTER Convert Decimal Degrees, DDM, DMS, UTM, MGRS, USNG, and Plus Codes. Auto-detect format. Copy results in one tap. DISTANCE & BEARING Vincenty geodesic distance and forward azimuth on the WGS84 ellipsoid—not flat-map shortcuts. Direct geodesic calculator (Pro). MAP & MEASURE OpenStreetMap tiles with path and polygon measure on the ellipsoid. Optional satellite layer (Pro). Go-to coordinate. Live GPS (Pro). FIELD NAVIGATOR (PRO) Walk to a coordinate with a live compass arrow and arrival alert. WAYPOINTS & GPX Save waypoints on your device. Export GPX 1.1. Import GPX waypoints (Pro). Free tier: up to 20 waypoints. UNITS & LANGUAGES Metric, imperial, or nautical. Twelve languages. Dark theme for outdoor readability. IN-APP PURCHASES Free to download with ads. GEO Calc Pro is a one-time, non-consumable in-app purchase—no subscription. Pro unlocks direct geodesic calculator, live GPS, field navigator, satellite map layer, GPX import, and unlimited waypoints. Restore purchases anytime from Settings or the Pro screen. INTERNET & LOCATION Map tiles load over the internet from OpenStreetMap. Live GPS and field navigation use device location when you allow it. Not for certified legal surveying. Verify critical measurements with professional methods.

Find a position on the map from nothing but compass bearings. Compass Triangulation is a resection tool: take two or more magnetic compass bearings from known observation points toward the same distant object, and the app calculates where that object is, with a confidence rating and an uncertainty radius, not just a single guessed point. It's built for search and rescue teams, land surveyors, wildland firefighters, hunters, and anyone who needs to turn "I saw it from here, at this heading" into coordinates. FREE FEATURES • Unlimited bearings. • Add a bearing by typing it in, capturing it live from GPS and the device compass, or importing one shared by QR code or link. • Automatic intersection: with two or more non-parallel bearings, the app computes the averaged intersection point, a confidence rating based on the crossing angle, and an estimated uncertainty radius. • UTM and MGRS coordinates, alongside latitude and longitude. • Nearest-address lookup for the computed point. • QR code and link sharing, including magnetic declination, so the same bearings resolve to the same point on another device. • JSON export and import, full backup and restore to a file you control. • Manual magnetic declination, street and satellite maps. • Shared links open straight in the app. PRO, A ONE-TIME PURCHASE • GPX export: your bearings and computed location for Garmin devices, Gaia GPS, CalTopo, QGIS and other tools. • Saved session library. • PDF field report: the map with all bearing lines and the intersection, a table of every bearing with magnetic and true headings, coordinates in three formats, the confidence rating, the uncertainty radius and the nearest address. • Live magnetic declination from a geomagnetic model, updated as you move. • Civil Air Patrol (CAP) search grid overlay. • Offline maps: draw the area you'll work in and download it before you lose signal, with a size estimate first. • Keep the screen awake while you triangulate. No subscription: you're not paying rent on a tool you may use twice a year in a real emergency and constantly in training. Available in English, Español, Français, Deutsch, Português, Italiano, 日本語, 한국어.