1:50,000 Scale Map Ruler

Note: Product edges and interior cutouts are shown with a thin red line. Neither the red lines, colored background, nor map image are printed on the actual tool. (more info)

Product Description

This ruler can be used to measure or plot latitude/longitude coordinates, UTM/MGRS/USNG coordinates, and to measure distances in either meters or miles.

On the front side, the ruler has minutes and seconds on one edge and decimal minutes on the other edge, allowing you to use either notation. On the back side, the ruler has distance in meters on one edge, and distance in either 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. See the usage diagrams for more information.

The ruler is packaged in a handy clear vinyl storage pouch, and includes instructions for use.

Scale Maps Front Side Back Side
Span Ruler
in Minutes
in Seconds
in meters
in Miles or
Nautical Miles
  • Canadian National Topographic System (NTS) maps
  • USGS County series topographic maps
5 min 0.01 min 1 sec 50 m 0.05 mi

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Item description Quantity Price Quantity
1:50,000 Scale Map Ruler
Part Id: Ruler50, Made in United States, UPC: 824249110500
Quantities of 10 or more, shipped in bulk packaging. more info
1 - 9
10 - 24
25 - 99


  • 1:50,000 x 5 minutes
Tool Dimensions:
Height: 8.500 in. (216mm)
Width: 1.000 in. (25mm)
Thickness: 0.020 in. (1mm)
Weight: 0.130 oz. (4g)

Package Dimensions:
Height: 8.500 in. (216mm)
Width: 3.000 in. (76mm)
Thickness: 0.030 in. (1mm)
Made in United States.

How to use products like this...

Using a map ruler to plot/measure latitude longitude position

Measuring latitude with a map ruler
Measuring longitude with a map ruler

Here is a tutorial on working with latitude longitude coordinates.

Using a map ruler to plot/measure a UTM position with 10m precision

Map with UTM position

Here is information on using the Universal Transverse Mercator coordinates (UTM).

Here is information on using the United States National Grid (USNG).

Here is information on using the Military Grid Reference System (MGRS).