Tech manual 6th printing, support vehicle construction, page 123.
When not on Sand: –1 Cruising MP
When not on Snow or Ice: –1 Cruising MP
How is this intended to work? Recalculate cruise and flank MP at the start of the turn, during movement or at the end of the turn? Recalculate all movement if the unit traverses a single sand/snow hex?
What's the correct procedure when travelling over a mix of clear and sand (or snow) hexes specifically?
The Combat vehicle version in Tac Ops seems much more clear, just reducing base Cruise MP as part of the design.