A device includes a crutch (400) comprising at least two vertical crutch columns (404,405). A substantially flat panel (422) is attached to the crutch interior to the at least two vertical crutch columns. In one embodiment, the substantially flat panel comprising a marking receiving panel to accept a marking (530) from a marking instrument (531). The substantially flat panel can be at least partially coated with a marking receiving coating (302) in one embodiment.
