Players advance on an 8 by 8 grid towards the center where the North Pole Disc forms a square of it’s own. Each square can only hold one Pawn. You cannot move through occupied squares. You can only move into an occupied square by ambushing a Pawn, knocking it back to its Ship (exception happens after the Ice Mask Pile runs out).
You cannot step over cracks but you can bypass them with a diagonal move as long as you don’t cross a continuous crack.
Each side of the grid has a four square wide Base Camp.