You can create SVG files and upload them to wiki pages. When you link to them, you need to link to the image data itself (and not to the page containing it). Here’s how to do this. Assume we have a file called Subsector.svg and we want a link called Map to this image.
[[image:Subsector.svg]][image:Subsector.svg][ and paste the image location, add a space and Map]. The result could look something like the following: [http://campaignwiki.org/wiki/Kaylash/download/Karte.svg Map] (where “Karte.svg” is your “Subsector.svg”)The result for our example: Map.
You can create SVG maps using the Traveller Subsector Mapper, for example.