Cartographia Imperialis: Free 3D Map Charts 52 Worlds of Warhammer 40K

You click, drag, and suddenly you’re staring down a segmentum instead of a spreadsheet. That’s the pitch behind Cartographia Imperialis, a free browser-based 3D map of the Warhammer 40,000 galaxy built solo by a hobby developer going by Sami Gashi, and reported this week by PC Gamer.

52 Worlds, Two Eras, One Browser Tab

The official site describes the project simply as a way to “fan-made interactive 3D map of the Warhammer 40,000 galaxy, featuring 52 worlds, M41 and M42 eras, the Great Rift, routes, and lore dossiers.” That’s not a static image. It’s a navigable chart you fly around, with everything from Terra to frontier hive worlds plotted as clickable points.

PC Gamer’s write-up compared the effect to a familiar sci-fi touchstone, noting the map “has the same simple, awe-inspiring majesty as Mass Effect’s take on the concept, and you can explore it like an isometric videogame: Left click and drag to pan around, right click to rotate the camera, mouse wheel to zoom in and out.” You can also jump straight to a location by name rather than hunting for it visually.

Fans found the project through a Hacker News thread, where the reaction split between admiration and technical notes:

Segmentums, Search Filters, and In-Universe Lore Text

Cartographia Imperialis isn’t just a pretty starfield. Its own guide page explains that the archive panel can also search by name and filter records by segmentum or world type, which is useful when the chart becomes crowded at a wide zoom level. The broad regional split follows Games Workshop’s own geography, since the broad segmentum labels divide the Imperium into Solar, Obscurus, Pacificus, Tempestus, and Ultima.

Every marked world gets a written dossier, and PC Gamer’s reviewer wasn’t sure whether the text was lifted or original, writing that they weren’t sure “where creator Sami Gashi sourced the text for entries, pulling straight from official sources or paraphrasing in their own words, but I quite like the very in-universe prose.” One example flagged from the entry for the hive world Jouran reads: “Its dossier is a reminder that strategic maps hide ordinary misery behind a clean point of light.” That’s the kind of grim little detail 40K lore readers live for.

Free, No Ads, and a Ko-fi for Whatever Comes Next

There’s no paywall and no catch. PC Gamer’s testing found Cartographia Imperialis is completely free with no ads, and the map is shockingly lightweight for its graphical presentation and the current state of the internet, loading super quick with no experienced slowdown clicking around. For a hand-built hobby project running full 3D navigation in a browser tab, that’s a genuinely solid technical result.

Gashi does have a way to accept support. According to PC Gamer, creator Gashi has a Ko-Fi page set up if you would like to support them, and they indicate an interest in creating interactive maps for other fictional worlds as well. No timeline or specific franchise has been named for that follow-up.

What the Hacker News Crowd Wants Fixed

Not every note was glowing. One commenter on the Hacker News thread flagged performance issues directly, writing that there’s “definitely a sense of latency when just moving my mouse around,” and questioned whether the 3D rendering, likely built with the three.js library, was hitting avoidable frame-rate limits. The same thread raised a smaller cosmetic gripe: background stars cluttering the void around the galaxy itself.

Other requests centred on deeper lore integration rather than bugs, with users wanting book and codex cross-references attached to each world marker so the map could double as a reading index. The project makes clear it isn’t trying to replace canon anyway. It bills itself as an unofficial, fan-made lore reference, not affiliated with or endorsed by Games Workshop.

Our view: this is exactly the kind of fan-built tool the 40K community keeps needing and rarely gets for free. Between codex reprints, shifting eras and a lore timeline that spans ten thousand years, a clickable map that actually loads fast is worth more than another glossy trailer. Whether Gashi turns the Ko-fi support into a second map for another universe is the only open question left.