Couple issues:
POSITION CAMERA x,y,z
or
POSITION CAMERA Camera Number,x,y,z
you only have three arguments in your command, so it assumes the default camera, and hence you are constantly positioning your camera at x=1, y=50, and z=wierd number
also if you are using advanced terrain commands to generate your terrain try using the GET TERRAIN GROUND HEIGHT command instead i.e.
POSITION CAMERA camera position x(), GET TERRAIN GROUND HEIGHT(1, camera position x(), camera position z()), camera position z()
This is not the Sig you are looking for....