Map Rulers - Nautical Set

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

Eight of the most frequently encountered scales used on NOAA’s marine navigation charts.

These rulers 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 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 on the other edge.

Latitude is measured directly with the rulers. But, since a degree of longitude covers a shorter distance as you move towards the poles, the rulers are used on a diagonal to measure longitude. See the usage diagrams for more information.

The rules are 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
  • NOAA Marine charts
0.5 min 0.01 min 1 sec 5 m 0.005 nm
  • NOAA Marine charts
0.5 min 0.01 min 1 sec 10 m 0.01 nm
  • NOAA Marine charts
1 min 0.01 min 1 sec 10 m 0.01 nm
  • NOAA Marine charts
  • British Columbia TRIM Maps (Terrain Resource Information Management)
1 min 0.01 min 1 sec 10 m 0.01 nm
  • NOAA Marine charts
2 min 0.01 min 1 sec 10 m 0.01 nm
  • NOAA Marine charts
2.5 min 0.01 min 1 sec 25 m 0.01 nm
  • NOAA Marine charts
5 min 0.05 min 1 sec 50 m 0.05 nm
  • NOAA Marine charts
10 min 0.05 min 5 sec 50 m 0.1 nm

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Item description Quantity Price Quantity
Map Rulers - Nautical Set
Part Id: NauticalSet, Made in United States, UPC: 824249110067
Quantities of 10 or more, shipped in bulk packaging. more info
1 - 9
10 - 24
25 - 99


Height: 9 in. (229mm)
Width: 3 in. (76mm)
Thickness: 0.02 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).