Boxell's Chandlery
A Division of C.G. Edwards

12 "B" St., P.O. Box 358
Boston, MA 02127
Phone: (617)-241-2800 * Fax:(617) 268-8845



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Parallel Rulers

These navigator's parallel rulers are inscribed with full 180° protractor markings. The middle of the bottom edgeforms the protractor center when the arms are closed. This tool combines the essential features of a protractor plotter and a basic parallel ruler. Allows courses to be measured from a convenient meridian. Made or extra strong, crystal clear acrylic.
Avaialble in 12", 15", 18", and 21" Models, and a 12" triple parallel.

Qty Product Description Price
WPL24 24 in Parallel Rule
0.25" Thickness. Rigid chrome arms and handles
WPL138 18 in Aluminum Arm Parallel Rule
0.19" thickness. Aluminum arms and handles
WPL139 12 in Aluminum Arm Parallel Rule
Without protractor markings, this ruler has the same specifications as model 140
WPL140 12 in Aluminum Arm Parallel Rule
.022" Thickness, aluminum arms and handles
WPL141 15 in Aluminum Arm Parallel Rule
.022" Thickness, aluminum arms and handles
WPL142 15 in Deluxe Brass Arm Parallel Rule
0.14" Thickness, Solid brass arms and handles
WPL145 15 in Value Parallel Rule
Accurate and durable milled acrylic ruler with marine aluminum and handles.
0.12" thickness
WPL136 12 in Triple Parallel Rule
The unique 3 rule construction allows greater parallel walk without the diagonal creep associated with traditional designs.
Milled with a beveled edge, 0.19" thickness with aluminum arms and handles
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Protractor Triangles

Protractor Triangle with Handle
This triangle is inscribed with contrast enhancing colors making it easier to use. Using two 45° triangles provides an easy method of plotting and performing chart work. With its protractor scales, the triangle is easily aligned in any direction with a chart meridian. Direction is maintained as one triangle is slid along the other to the desired position. Durable, clear vinylite. Short sides 7-1/2", .08" thick,

Protractor Triangle
Same as above, with all black markings and without handle

Qty Product Description Price
WPL101 Protractor Triangle with Handle $15.99
WPL103 Protractor Triangle Black Markings-For NavPak $14.99


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Weems Parallel Plotter

This instrument consists of a plotter mounted on a roller. The plotter contains distance scales at 1:20,000, 1:40,000, and 1:80,000 to fit the N.O.S. Coast and Harbor Charts, as well as an inch scale. Included are a semi-circular protractor for measuring courses and bearings against a meridian on the chart, and two quarter circle protractors for measuring courses and bearings against a parallel of latitude. Courses and parallel lines are transferred and kept parallel by means of two rollers which are mounted on a slide axis. Used for measuring or laying off courses and distances on a nautical chart.
Instructions included.

Qty Product Description Price
WPL120 Weems Parallel Plotter $24.99

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Weems Compact Parallel Plotter

A smaller version of our traditional rolling plotter. The 8" x 2" plotter, mounted on a marine aluminum roller assembly, contains a semi-circular protractor, distance scales of 1:20,000 and 1:40,000, as well as an inch scale.
Dimensions: 2" x 8".

Qty Product Description Price
WPL60 Compact Parallel Plotter $24.99

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Weems Course Plotter

This is a 15" course plotter with a semi-circular protractor scaled from 180° to 360° inside. Lower edge scales 1:80,000 and 1:40,000 to accommodate National Ocean Survey charts. For north and south courses, a small auxiliary protractor scale is printed inside the larger one and is used against a parallel latitude. The upper edge is scaled 1 inch equal to 20 miles to accommodate the VPOS Universal Plotting Sheets.
Dimensions: 4.375" x 15".

Qty Product Description Price
WPL133 Course Plotter $14.99

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The Vecta-Rose is a pressure sensitive compass rose that can be applied directly to your charts when the printed rose is not in a convenient location. Can be oriented to either true or magnetic north for handy reference.
Dims: 4.5" x 4.5".

Qty Product Description Price
WPL512v-6 Vecta-Rose (pack of 6) $8.99
WPL512v-12 VEC Vecta Rose Pack of 12 $12.99

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Three Arm Protractor

Heavy duty, crystal clear acrylic construction is the foundation for this simple to use, professional plotting aid. Arms are rigid enough to trace a bearing line. Can be used to position and chart from three identifiable shore, landmark, or buoy locations. Just measure the angles on the protractor and locate your position on the chart. Moveable arms have a vernier scale for even more precise measurements.
Dims: 6" x 21".

Qty Product Description Price
WPL116 3-Arm Protractor $34.99

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Weems Protractor

This navigation tool is versatile and can be used to lay off a course or a bearing, measure distance between any two points, plot a position on a chart from a given set of coordinates, or determine the coordinates of a position on a chart. It is an updated version of the Breton and Portland Plotters. Pencil and sharpener included.
Dims: 15" x 5".

Qty Product Description Price
WPL255 Weems Protractor $23.99

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The Original Bi-rola

This rule’s patented vertical and horizontal rolling motion simplifies course and plotting calculations, while the unique radial arm allows you to automatically include compass corrections in your course plotting.

  • Patented four-way rolling motion
  • Roller body has protractor markings and a nautical mile scale
  • Radial arm has Loran interpolator scales and 200 millimeter rule
  • Automatic compass corrections
  • When radial arm and body are used jointly, the birola rule becomes a 440 mm (17") divider (approximately)
  • A speed/time/distance table is included
  • Easy to follow instructions
  • Packaged in a protective, durable vinyl pouch

Dims: Length 13-7/8", Width 2-5/8", Thickness 1". Wt. 12 oz.

Qty Product Description Price
WPL155 Bi-Rola Rule $84.99

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P.R. 500 Rolling Plotter

Made with the professional in mind, the P.R. 500 has aconsiderably larger body than the smaller bi-rola rule. Built to take rigorous use aboard commercial and blue water vessels, the P.R. 500 provides one of the easiest methods invented for plotting courses.

  • Patented four-way rolling motion
  • Roller body has protractor markings every 1/2 degree
  • 1-1/4" magnifying lens for enhancing chart data
  • Easy to follow instructions
  • Packaged in a protective, durable vinyl pouch

Dims: Length 19-5/8", Width 3-5/8", Thickness 1-1/4".
Qty Product Description Price
WPL220 18 in Bi-Rola Rule $147.99

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Square Course Plotter

Used by the United States Power Squadrons for years, this plotter is a similar design to our square protractor, only it is slightly larger and incorporates a compass rose in the center to make calculating courses, bearings, and variation much easier. Comes in a convenient storage sleeve imprinted with easy to follow instructions.
Dims: 7-3/4" x 9

2802 Square Protractor (Not Shown)

This plain edge protractor is suitable for plotting courses and bearings. Notations can be made directly on the matte plastic surface with a pencil. Constructed of durable, transparent plastic. Instructions included.
Dims: 5" square.

Qty Product Description Price
WPL2802 5 in Square Protractor $10.99

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The Weems & Plath Compute-A-Course™ is a compact, multi-purpose plotting tool. Ideal for general boating or commercial use. The Compute-A-Course™ can be used for position fixing, course plotting, and distance measurements with the included scales. Using the log scale on the instructions, time/distance calculations are a snap. Instructions included.
Dims: 7-3/16" w x 8-1/2" h.

Qty Product Description Price
WPL111 Compute-A-Course $30.99

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An advanced navigation tool, the circular slide rule provides for the solution of time, speed and distance, fuel consumption, conversions, multiplication, and division. On the reverse, the face of the Vectormaster permits rapid solution of problems involving vectors, such as those encountered in current sailing, the determination of true wind direction and force, and the apparent wind to be expected on other headings. Given the position of a storm, and the direction and speed of its advance, you may quickly determine the course which will put maximum distance between your vessel and the oncoming storm. Instruction booklet included.
Dims: 7" square.

Qty Product Description Price
WPL501V VEC Vectormaster $38.99

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Nautical Slide Rule

Gives immediate solution to all speed-time-distance problems. Equally applicable for nautical or statute miles. Speed in knots or m.p.h., time in hours, minutes, or seconds, and distance in nautical or statute miles (or yards if desired, and if speed is in knots.) Easy to read and accurate. Standard in U.S. Navy.
Dims: 7-3/8" square.

Qty Product Description Price
WPL105 Nautical Slide Rule $24.99

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Course & Leg Identifier

for Expanding Square Pattern & Sector Pattern Searches
Also known as the Search Pattern Slide Rule or Coast Guard Plotter, this tool is a “must have” for active duty Coast Guard, Auxiliarists, or anyone else who might have to run a search pattern. The Course & Leg Identifier quickly calculates the heading and run time for each leg of either an expanding square pattern or sector pattern search, giving you more time to focus on the search.
Dims: 6"x 9".

Qty Product Description Price
WPL113 Course & Leg Identifier for Search & Rescue $29.99

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Universal Plotting Sheets

These are also known as VP-OS sheets. A graduated circle printed at the center allows meridians of longitude to be constructed for any latitude, thus creating a custom-made chart for any geographical position. Available as a 50-page Plotting Sheet Pad.
Dims: 12-7/8"x 14".

Qty Product Description Price
WPL5910 Universal Plotting Sheet $14.99

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Radar Collision Avoidance
and Current Plotting Board Set

Provides the mariner with an easy method for plotting radar targets to determine their course speed and possible risk of collision. Where current exists, navigators can also use the board for determining course to steer. Complete instructions and examples from the Editors of Ocean Navigator Magazine are printed on the back. Constructed of matte finished, film laminated PVC, the board is designed to be used with a lead pencil for accuracy, then erased. Provided complete with a special suction cup/pencil point compass. Dims: 13" square.

Qty Product Description Price
WP10855 W & P Collision Avoidance Board Set $ 24.95

Please Note:
With all the recent cases of on-line credit card and Identity theft,
we feel obliged to inform our customers that neither
C.G. Edwards Co Inc. or Boxell's Chandlery,
under any circumstance sell or divulge any personal information about our customers,
nor do we in any way store confidential information on our server.
Please be assured that we will continue to do everything within our power to keep any
information submitted by our customers as secure as we possibly can.

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This page updated January 7, 2009

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