I was poking through the ship speed code yesterday, and realized a few things
weren't set how I had intended them to be.

Flying over/sailing through swamps is supposed to slow you down a bit.
However, the amount you were slowed down was much higher than it should have
been. This has now been fixed. Note that the penalty to the lift magi's spells
for flying over this terrain has <not> been affected; hence you could still
easily be affected by the <separate> speed penalty associated to just barely
clearing a terrain's height.

Secondly, there is a penalty to speed from using the see invis ability (your
crew is being distracted from their regular duties to search for other ships).
This penalty was also much higher than I meant for it to be, and has been
similarly corrected.

Melemkor