Final answer:
Polar projection maps are equidistant projections that can display correct distances from the center, but they do not preserve size and shape accurately.
Step-by-step explanation:
A polar projection map is a type of equidistant projection, which means it can accurately display distances from the center of the projection to any other point. However, equidistant projections typically cannot show both size and shape correctly along with distance and direction. For example, Mercator projections, which are another type of map used often for navigation, can maintain accurate direction but distort size especially as one moves further from the equator, causing landmasses closer to the poles to appear larger than they actually are.