Blindsight does not grant enough vision

The blindsight vision currently only grants token vision equivalent to blindsense. This is problematic in terms of how the creature maneuvers around the map, if this is her only sense. To quote the rules text: a Creature with Blindsight maneuvers and fights as well as a sighted Creature. This implies, that the creature is not only capable of sensing other creatures, but also walls and other obstacles in her way, since it is capable of relying only on her blindsight (as opposed to blindsense) to maneuver around the world. A good enough approximation would probably be to give the creature black & white vision the same way darkvision would, as the creature can sense the general outlines of things, but likely not their actual colors.