It takes into account the ship's radar range, so if you have another mod which changes radar ranges, this mod will adjust its behaviour to match.
As a test, I commanded a Discoverer to explore an undiscovered sector, and you can see images of the progress below. I have almost no ships in this save - everything in that sector was revealed by the Disco, and nothing else.
Initial state - sector is undiscovered
Part-way through the command
Just after the command finishes
Download
Nexusmods
Plans/Todo
Need ideas...!
Changes
0.52 - 2018-12-21
- Remove save-game stickiness
- Radius now begins from the nearest undiscovered hex, if that wouldn't be too close
- Fix content.xml missing placeholder language tags
- Initial release