Coordinate Converter
Convert live between Decimal Degrees, DMS, UTM, MGRS and Geohash, with an interactive map. Click or drag the marker to set a location.
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The lab of Maxwell Howe
Useful tools. Maps. Small games.
Everything I build for fun and everyday use lives here: 76 browser tools, plus maps, games, and experiments — each at a first-party mapzimus.com path.
76 browser tools
Free — no accounts
No installs, no tracking
Start here
Featured
A short list of favorites, updated now and then.
Boston in Motion
One live map of everything moving through Boston — MBTA trains, buses, ferries, Amtrak, planes over Logan, harbor AIS, and Bluebikes, all client-side.
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Whydah's Voyage
Steer Black Sam Bellamy's 1717 voyage from the Caribbean to Maine — ten missions, ship battles, and the nor'easter the real crew never beat.
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Bottle Game
A bottle-flip party game — flick for a clean 360°, land upright, and steal lives across the table. Win a game to unlock the parrot skin. Installable PWA with Matter.js physics.
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U.S. Fantasy Transit Network
A generated four-tier North American transit network connecting Census places at continental, regional, metro, and commuter scales.
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Bug Wars
A compact browser strategy game about building an insect colony and surviving rival swarms.
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Train Route Atlas
Twelve legendary train routes — high-speed, scenic, night, and classic — draped over an interactive 3D globe with specs, filters, and popups, all client-side.
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Where the Games Go
A 3D globe of North Shore Nostalgia eBay shipments — generalized destinations, great-circle routes, and sales geography from Salem, Massachusetts.
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