Slide-Sky-Disks With Grid Masks Showing Azimuths and Altitudes.
Identifying Moderately Bright Navigational Stars.
Slide Sky-Map for Displaying Tropical Stars.
Detecting Counterfeit Currency, Australian Polymer Dollars.
Detecting Counterfeit Currency, US Dollars.
Measuring Angles and Distances for Outdoor Survival.
Detecting Counterfeit Polymer Vietnamese Money
Finding North and Time by Stars in the Tropics
Finding North Direction and Time by Any Bright Star.
Shadow Stick Navigation and Graph of Solar Paths.
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