Trig tables
Here's one link on the subject:
http://www.sosmath.com/tables/trigtable/trigtable.html
Trigonometry tables have been around
for thousands of years.
Here's a generic wiki link on the
subject: http://en.wikipedia.org/wiki/Trigonometry
Trigonometry can be viewed as an
offshoot of geometry: http://en.wikipedia.org/wiki/Geometry
Both school sets will help many
during hard times.
Even GPS (http://en.wikipedia.org/wiki/Global_Positioning_System
) uses simple plane geometry at the most fundamental level, although it can get
pretty complicated, too. Plan B is just to have a map or diagram or road map,
and use that and maybe road signs instead.
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