A
870 version
s_left 	s_right t_bottom t_top
 0	14	 0	393	// comment: altitude 100000
14	28	 0	393	// comment: altitude 10000
28	42	 0	393	// comment: altitude 1000
42	54	 0	393	// comment: altitude 100
54	75	18	132	// comment: altitude 10 (20 feet of increment)
200				// comment: feet per tickmark (small)
1000				// comment: feet per tickmark (big)
400				// comment: feet per label
  0.15			// comment: pixels per foot
