Tide

Space is not consistently permeable to the transition drive of your thoughtship. Sometimes it is easier for your thoughts to penetrate space, sometimes it is harder. This is referred to as the tide.

At high tide, space is highly permeable, and your thoughtship can go further each transition. At low tide, the effort is further and your ship cannot go as far.

A full cycle of tide takes about 20 hours. Plan your flights accordingly. Check what is nearby at the different tide marks. Some systems may be completely isolated during high tide. Don't get caught in one unless you want to. On the other hand, such hard to reach systems make great backup bases.