Antipode finder
Find the antipode of a city, coordinate pair, or map pin, then inspect the opposite-side latitude and longitude, daylight inversion, solar-time shift, and Earth-through distance.
Specific calculators, planners, and explainers for jobs that usually get buried in forums.
HTML-first, no account wall
Shareable URLs and direct outputs
Topic hub
Maps and geography tools
Tools for latitude, antipodes, Mercator distortion, walksheds, navigation, and other map-heavy geography questions.
These pages make map and geography questions more legible: how far north a city is, what sits on the opposite side of Earth, how projection distortion grows, and how street networks shrink walking reach.
Tools in this cluster
City latitude comparator
Compare the latitude of two cities or pinned map locations, see which is farther north, and inspect daylight and distance context.
Great circle vs rhumb line explorer
Compare great-circle and rhumb-line routes between two cities or map pins, with live distance, bearings, midpoint, and route-shape overlays.
Latitude twin finder
Find cities on roughly the same latitude or mirrored across the equator, with city search, map input, and daylight context.
Longitude by chronometer explorer
Calculate longitude from local apparent noon and Greenwich chronometer time, then model clock-drift error in degrees, nautical miles, and kilometres with John Harrison context.
Mercator distortion explorer
See how Mercator map distortion grows with latitude using a city picker, map pin, and live scale and area exaggeration readout.
Photo location privacy checker
Check whether a photo contains GPS EXIF metadata, capture time, altitude, or camera-direction clues that can reveal where it was taken, with local-only browser analysis and a simple world-map view.
Walkshed explorer
Compare a simple walking radius with a network-based walkshed using street pattern, block size, diagonal cut-throughs, barrier crossings, and pedshed ratio.
Recent launch notes
Launched a photo location privacy checker for GPS EXIF leaks, map context, and share-before-you-send checks
Added a client-side photo privacy checker that reads GPS-related EXIF metadata, explains what location clues a shared image can leak, and plots the exposure on a simple world map.
Updated the Mercator distortion explorer to explain why row heights grow, not just widths
Improved the Mercator page with a clearer answer to the common row-height confusion, including exact 1° band spacing, a new parallel-spacing visual, and a sharper split between same-size patches and graticule cells.
Launched a great circle vs rhumb line explorer with live route geometry, bearings, and Mercator-aware map overlays
Added a navigation-heavy maps tool that compares great-circle and rhumb-line routes between two cities or map pins, then shows the distance penalty, bearings, midpoint, and route shapes on a world map.