Gives a 3 dimensional representation of height in addition to colour. Two different 3D representations can be toggled with the M key once data has been loaded. The orthographic angle can be altered to provide an ideal looking display by use of the O and ctrl-O keys. A different colour set can be toggled with the P (for Palette) key.
Screenshot of 3DMAP.EXE (centred on Ben Nevis) :-