Is the cm is displayed?

Hello! Unfortunately just inches are displayed.

For taking basic nav course, could this be used instead of the standard par. rulers/divider/prot? iow, could i take base course using this? thanks

I would use this as an adjunct. You need to know how to use parallel ruler, dividers etc on a map for the navigation course.

What is the maximum distance between the 2 rulers, commonly called the opening width? Thanks!

Hi Caroline, this ruler does not open up, it is a rolling type of plotter. Regards Mark

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Description

🧭 Navigate Like a Pro — Don’t Just Sail, Command the Seas!

COMPACT LIGHTWEIGHT DESIGN - At just 0.31 lbs and 12.5 inches long, it fits perfectly in your navigation toolkit without weighing you down.
BACKED BY WEEMS PLATH LEGACY - Trusted by professionals worldwide, this plotter blends tradition with precision for your next voyage.
DURABLE ALUMINUM ROLLER ASSEMBLY - Smooth, reliable plotting on the go with a marine-grade roller designed for longevity and ease.
PROTRACTOR SET FOR ACCURATE BEARINGS - Includes semi-circular and two quarter-circle protractors to master every angle and course correction.
TRIPLE DISTANCE SCALES FOR ULTIMATE PRECISION - Navigate confidently with 1:20,000, 1:40,000, and 1:80,000 scales tailored for N.O.S. Coast and Harbor Charts.

The Weems & Plath Marine Navigation Parallel Plotter is a precision plotting tool featuring three distance scales (1:20,000, 1:40,000, 1:80,000) optimized for N.O.S. Coast and Harbor Charts. It includes a durable aluminum roller assembly and a set of protractors for accurate course plotting. Compact and lightweight, this plotter is designed for professional and recreational mariners seeking reliable, easy-to-use navigation tools.

Specifications

Item dimensions L x W x H	12.5 x 3 x 0.5 inches
Brand	WEEMS & PLATH
Color	black
Included Components	Aluminum roller assembly, Semi-circular protractor, Two quarter circle protractors, Instructions on back of plastic storage sleeve
Item Weight	0.31 Pounds
OEM Part Number	120
Global Trade Identification Number	00721002001207
Automotive Fit Type	Universal Fit
Manufacturer	Weems & Plath
UPC	721002001207
Item Package Dimensions L x W x H	13.46 x 4.17 x 0.71 inches
Package Weight	0.17 Kilograms
Item Dimensions LxWxH	12.5 x 3 x 0.5 inches
Brand Name	WEEMS & PLATH
Country of Origin	China
Suggested Users	womens
Part Number	120
Sport Type	Boating

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