Section T Errata
Rework T3.10 for clarity, by breaking off war hull text. Add B4.25 reference.
(T3.10) This is normal space that has not been surveyed by any empire. It is impassable to the majority of "War Hulls" (B4.20), and the determination of whether a map hex is unsurveyed or not is made at the start of the turn. Scouts and survey cruisers (B4.25) may survey it via (B4.25).
New rule (pulling in text removed from T3.10 and expanding upon it):
(T3.20) War Hulls. It is impassable to "War Hulls" (B4.20) other than SR types (B4.35). They may attempt to enter a hex that started the turn as unsurveyed, but for which the survey completed on a previous segment before the War hull attempted to enter the hex. If a War hull ever tries to move into an unsurveyed hex it immediately performs a RX-SS (C2.70) in the originating hex.
Example: A FFS completes surveying a hex on segment 4. A war hull could enter the hex on segment 5 or later. If its orders had it entering that hex on segment 4 or earlier, it would instead perform a RX-SS instead.