Map Ruler – 1:24,000 (USGS 7.5 Mnute Series)

Map
Ruler – 1:24,000 (USGS 7.5 Minute Series)

Each ruler
is designed for a specific scale map.
* *    You must use a ruler that matches the scale of
your map.    * *

On the front side, the
rulers have minutes and seconds on one edge and decimal minutes on the
other edge, allowing you to use either notation. On the back side, the
rulers have distance in meters on one edge, and distance in either miles
or nautical miles on the other edge. Latitude is measured directly with
the ruler. But, since a degree of longitude covers a shorter distance as
you move towards the poles, the ruler is used on a diagonal to measure
longitude. The rulers are printed on a sturdy 20mil white plastic stock
for durability.