No Safe Solar Route?

[chesspupil]

I am finding after having explored a map that when I am trying to navigate to a place somewhere in the neighborhood of 50 squares or more away I get a message "no safe solar route" despite that the 'route' has been visited.

Why is this?

Is this a bug or can we change the rules for 'no safe solar route' to include that passage is allowed if the square is already lit?

[Cory Trese]

That's the max length of the 4X pathing system -- I can see if I can increase it without hitting the CPU limit.