1  2  3 

1  _  _  _

2  _  _  _

3  _  _  _


ACROSS
1)  the quality of a color as determined by its dominant wavelength
2)  macular degeneration that is age-related
3)  a navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on earth by computing the time difference for signals from different satellites to reach the receiver


DOWN
1)  an ugly evil-looking old woman
2)  an official at a baseball game
3)  a rapid automatic system to detect plastic explosives in passengers' luggage using x-ray technology and computers; designed for use in airports

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