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Nautical
Slide Rules and Calculators
Link to our celestial navigation pages for a
selection of celestial
navigation calculators.
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Weems
& Plath Nautical Slide Rule
Derive an immediate solution to all
speed-distance-time problems for answers in
nautical or statue miles. Calculate
speed in knots or miles-per-hour; time in
hours, minutes or seconds; and distance in
nautical or statute miles (or yards if
desired). It's a standard for the U.
S. Navy.
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Weems & Plath
Vectormaster
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 can quickly determine the
course which will put maximum distance
between your vessel and it. A circular
slide rule is located on the reverse for the
quick solution of time, speed, and distance
problems. Instructions included.
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Weems & Plath
LIGHTrules
If you’ve ever been on the water at night
and wondered if the lights you see are from
an approaching or fleeing vessel, or if you
wonder if the vessel is a fishing trawler or
super tanker then LIGHTrule is for
you. It's a durable two-sided black
PVC slide rule with lights and shapes
displayed in patterns for identification.
This simple-to-use vessel identification
tool shows the actual view of vessels for
Port, Starboard, Bow and Stern lights.
LIGHTrule identifies all the light
configurations in a magnified viewer to make
vessel descriptions easy to read. It also
displays audible signals for restricted
visibility, maneuvering and warning. It's
inexpensive security for night travel and
should be an essential part of the equipment
found on any boat.It's also an excellent
aide for navigation classes and Coast Guard
exams, too.
Versions available for U. S. and
International lights and signals.
Constructed of extremely durable plastic and
stored in a vinyl sleeve. Dimensions: 16” x
5 ¼”
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Weems & Plath ROADrules
ROADrule identifies the most
common aids to navigation, rules of the
road, and maneuvering and warning signals
for U.S. or international waters. This
simple-to-use identification tool shows the
actual view of maritime buoys with
corresponding chart symbols. It describes
bridge lighting and waterway markings.
ROADrule takes a large amount of complex
information and makes it easy to understand
and quick to refer to. Whether in a
classroom or at the helm, it provides
valuable assistance to make critical
navigation decisions quickly and with
confidence.
ROADrule is constructed of durable
two-sided black PVC. Its design is similar
to a slide-rule. The various buoyage markers
are drawn in color to match the chart
symbol. It complements the recently
introduced LIGHTrule that has become
an instant success.
Versions available for U. S. waters, European Inland Canals, and
International Waters. Dimensions: 16” x 5
¼”.
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Weems & Plath
Tactician's Calculator
The Tactician’s Calculator is a hand-held
tool for the racing sailor that provides a
visual depiction of what's happening on the
racecourse. It can help you determine how
square a starting line or racecourse is,
what your heading will be on the opposite
tack or gybe, how close you are to layline,
and what point of sail you will be on for
the next leg of the race. On the reverse
side of the tool, there is a key to the most
commonly used racing code flags that gives
you a picture of the flag and an explanation
of its meaning. There is also a
speed/time/distance table, and an area to
record both wind and racecourse information.
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| Ordering
Information: |
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122091 |
Nautical
Slide Rule |
$19.35 |
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| 122264 |
Vectormaster |
$29.25
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122648 |
LIGHTrule COLREGS
For U. S. and
international waters |
$24.30 |
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| 129865 |
LIGHTrule
CEVNI
For European Inland
Waterways |
$22.50 |
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129863 |
ROADrule USATONS
For U. S. Coastal waters
and the Intercoastal Waterway |
$22.50 |
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| 129862 |
ROADrule IALA
For International waters
according to the IALA Buoyage System |
$22.50
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129864 |
ROADrule CEVNI
For European Inland
Waterways |
$22.50 |
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122235 |
Weems &
Plath Tactician's Calculator |
$24.30
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Select other navigation
tools:
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