One lightyear

[Arkcon]

Originally posted by Phoenix-D:
the big map is 10 LY per square.

Someone else noted, the distance is a straight line from system to system, so you'll need the Pythagorean theorm to know for sure. And you only get a big zoomed in map when you activate a warp opener.

The following are the calibrations I work with:

Level 1 warp opener reaches almost nowhere on a sparse map, maybe a close neigboring system, you know, if adjacent systems lost their warp point.

Level 2 is better, maybe the first one that's worth while. But then, isn't that the case with every tech in SE4?

Level 5 goes almost halfway across the map, but by then, you have so many resources you could build 2 or more in your fleet and be practically anywhere in no time.