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Rolling Plotter
The Bi-Rola™ Rule
represents Weems & Plath®’s efforts to provide the very best plotting
tools. Constructed of heavy duty plastic with brass rollers, the Bi-Rola™ Rule
is built to withstand years of trouble free use, The Bi-Rola™ 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 yourcourse plotting. All together, the Bi-Rola™
Rule is the most completely self-contained plotting device in its class.
Dimensions: Length 13-7/8", Width 2-5/8", Thickness 1 “. Weight: 12 oz.
Features:
- 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 Bi-Rola™
Rule becomes a 440 mm (17") divider (approximately)
- A speed/time/distance table is included
- Easy to follow instructions
- Comes packaged in a protective, durable vinyl
pouch
Weems & Plath® Bi-Rola™ Rule Rolling
Plotter
Mfg. Part Number 155
Online Marine Price
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P.R. 500
Rolling Plotter
Made with the professional in mind, the P.R. 500 has a considerably larger body than
the smaller Bi-Rola™ rule. Built to take the rigorous use aboard
commercial and blue water vessels, the P.R. 500 provides one of the easiest methods
invented, to date, of plotting courses. Dimensions: Length 19-5/8", Width
3-5/8", Thickness 1 1/4". Weight: 1 lb. 10 oz.
Features:
- 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
- Comes packaged in a protective, durable vinyl
pouch
Weems & Plath® Bi-Rola™ Rule P.R.
500 Rolling Plotter
Mfg. Part Number 220
Online Marine Price
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Chart
Protractor
The Weems & Plath® Bi-Rola™ Chart
Protractor turns the tedious task of plotting into child’s play. This Chart
Protractor virtually eliminates the need for other devices except a pencil. Plotting
a course is as simple as laying the protractor along your course line and aligning the
compass disk. Laying off courses, bearings, distances and loran interpolation is so
easy you can forget about other methods. Corrections can easily be made for
variation and deviation. The body of the Weems & Plath® Bi-Rola™ Chart
Protractor also has scales for nautical miles, millimeters and loran interpolation.
Dimensions: 5-1/8" x 15-1/4". Weight 5 oz.
Weems & Plath® Bi-Rola™ Rule Chart
Protractor
Mfg. Part Number 225
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Waypoint Ruler
The Waypoint Ruler has been designed to simplify the process of transferring data
from electronic navigation aids to your paper charts. This instrument is ideal for
plotting latitude/longitude coordinates from devices such as Loran, G.P.S., Omega, Decca,
Transit, and celestial navigation computers. The Waypoint Ruler willl also give rapid
readings of true courses , bearings, and distances. The Ruler does not have to refer to
the charts' compass rose and can be used on the lap with badly creased and folded charts.
The Weems & Plath® Bi-Rola™ Waypoint Ruer comes with a handle
that also serves as a pencil holder, pencil, instructions and durable vinyl pouch.
Dimensions: 5-1/8" x 15-1/4". Weight 5 oz.
Weems & Plath® Bi-Rola™ Rule Waypoint Ruler
Mfg. Part Number 250
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