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Plotting Tools

Here are instruments that measure distances, determine time and direction, and transfer coordinates.  "W&P" and "C-T"  refer to Weems and Plath or C-Thru catalog numbers.

|Parallel Rules|  |Triangles|  |Course Plotters|  |Rolling Plotters|  |ChartKit_Plotter|  |Dividers|  |GPS Plotter|  |Time-Speed-Distance]  [Correction_Aids] [Chart Stowage]

Last Updated 10/31/2007

Parallel Rules

The traditional way to transfer direction to and from the compass rose. 

12" Rule  $14.00
W&P140
145.jpg (2237 bytes) 15" "Value Rule"  $11.00
W&P 145
18" Clear Rule  $11.75
C-T 1500-18-C
24" Clear Rule $17.00
C-T 1500-24-C
18" Black Rule  $11.75
C-T 1500-18-B
24" Black Rule  $17.00
C-T 1500-24-B
136b.jpg (19811 bytes) 12" Triple Parallel Rule 
Longer reach and symmetrical action for easier use. 
$18.00
W&P 136
Paralock Plotter
7" compact size, with locking knob to set the rules at any given separation to aid in the rapid plotting of GPS fixes.
$23.00
W&P 90

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Triangles

The course plotting tool most asked for by the professionals. Commonly used in pairs.

Protractor Triangle with Handle
Short sides 8"
$12.00
W&P101
Linex Navigational Triangle
from England, Short side 9"
$15.00
T1036

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Course Plotters

These descendants of early aviation units take their direction from meridians, not compass roses. Good for one-handed operation on folded charts.

Course Protractor Plotter Ruler  
One-piece design, with common nautical chart scales. 15" x 4"

$7.50
C-T P72

 

Course Plotter 
15" one-piece unit with common chart scales, plus the 20-miles per inch scale of the Universal Plotting Sheet.
$11.00
W&P133
 

Portland Course Plotter (previously known as the Breton Plotter) Has an adjustable internal rose that lets you enter local variation to get courses directly in magnetic. $22.95
T12975

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Rolling Plotters

These plotters have rollers for versatility and ease of use.

BiRolaWEB.jpg (96830 bytes)
click to enlarge

Parallel Plotter $19.00
W&P120
Compact Plotter $18.00
W&P060
Original bi-rola 
four-way rolling motion
$63.00
W&P155
P.R. 500 Rolling Plotter
A larger version of the bi-rola.
$99.00
W&P220

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ChartKit Plotter

ChartKit Plotter

Wt: 1 lb. 10 oz.
Dimensions: 22-5/8" x 20-3/16"
$99.00 W&P122

This affordable and portable navigation system is designed for accurate navigating with any chart, chartkit or chartbook. The plotter is made of solid wood and an integrated adjustable parallel arm fitted with a moveable compass rose. This permits the direct plotting of magnetic compass courses and firmly supports your chart work whether in the cockpit, on deck or below. Plot a course to a given point by locking the rule at a given bearing. By moving the rule so that the point is on an edge, you quickly determine the correct line of position on a chart for that bearing. A see-through acrylic sheet overlays and protects the chart as you plot and allows for notations using a dry erase marker (included). A tough custom nylon carrying case is included.

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Dividers

An essential took, used to measure distances and to transfer coordinates.

5" Nickel Plated Dividers 
Ideal for school use.
$11.00
W&P 259

7" Straight Brass Dividers $27.00
W&P172
8" Straight Brass Dividers $32.00
W&P 173

7" One-Hand Brass Dividers $36.00
W&P 170
8" One-Hand Brass Dividers $38.00
W&P 171
6" Millenium Dividers/Compass $14.00
W&P 179
176web.jpg (40023 bytes) 7" Ultralight Dividers/Compass
with center wheel. One of our best sellers.
$19.00
W&P176

7" Light Divider
Red LED bulbs built into the arms light up the chart without shadows. Center adjust wheel allow quick, precise one-handed operation.
$27.00
W&P 276

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GPS Plotter

It looks like a parallel rule, but the action is different. Used to quickly transfer waypoint coordinates. $32.00
W&P 130

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Time-Speed-Distance

Solve time-speed distance problems quickly and accurately.

105web.jpg (76672 bytes) Nautical Slide Rule
Easy-to-use circular pattern. 7" square
$18.00   W&P105

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Correction Aids

For the conscientious navigator who keeps his charts corrected.

Chart Correction Kit 
3rd Edition, from TransGraphics. Rub-off transfer sheets with abbreviations, letters and numbers, white-out patches, and almost 900 red, green, and black symbols.
$13.75   T5164

Chart Stowage

Keep those valuable charts clean, dry and unwrinkled.

Chartpak Tubes
 Lightweight polyethylene parts screw together securely for tight, water-resistant, ultraviolet-proof protection.
 
Chartpak  3 X 38 Black Tube  $14.30 T9809
Chartpak  4 X 38 Black Tube $16.45  T9811
Chartpak  3 X 38 Grey Tube $14.30 T9810
Chartpak  4 X 38 Black Tube $16.45  T9812
Telescoping Chart Case
3" diameter, length expands from 24" to 47". Shoulder strap.
$23.00  W&P 80

 

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