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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About
The person behind the lab
Mapzimus is the personal lab of Maxwell Howe — GIS analyst and math teacher on Massachusetts' North Shore.
This is the fun half of my work. I build small browser tools I actually use — coordinate converters, geocoders, chart makers, classroom helpers — along with maps, games, and experiments that don't need to justify themselves. Everything here is free, runs in your browser, and asks for nothing.
The serious half lives at maxwellhowegis.com: case studies, professional GIS work, and the projects I'd show an employer. If you're deciding whether to hire me, start there. If you just want a good sun calculator, stay here.
The radars track what's new in GIS and dev tooling every day.
Sampler
A few favorites
55 tools and counting — these are good places to start.
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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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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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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