This chapter has only one part on the computer: Exercise 4E - Locating the unknown rock samples, done on two images.

	Locating Unknown Rock Samples 1 - 5.  The view is toward the northwest, and you are not seeing all the map.
	Locating Unknown Rock Samples 6 - 8.  This view is toward the west from the east edge of the map area, and you are not seeing all the map.  It shows the south-facing cliffs in the east-central part of the map (1,000 meters north of the south edge of the map).