Navigation Instruments

Electronic charts are wonderful until the power fails. A paper chart and a set of proper chart tools never do. This collection brings together navigation instruments from Weems & Plath, the Annapolis maker that has served navigators since 1928.

Choose from brass dividers and pencil compasses, parallel rules and rolling plotters, quick-reference slide rules for lights and buoyage, chart weights and magnifiers, complete navigation sets and red-light chart lamps for night passages.

Showing 1-32 of 32 item(s)

Weems & Plath Brass Compass Chart Weight - 76 mm

Weems & Plath Brass Compass Chart Weight - 76 mm 2

Chart Weights & Magnifiers

Weems & Plath Brass Compass Chart Weight - 76 mm

A forged brass ring around a working liquid-filled compass: chart weight at sea, handsome paperweight ashore.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Nickel-Plated Compass Chart Weight - 76 mm

Weems & Plath Nickel-Plated Compass Chart Weight - 76 mm 2

Chart Weights & Magnifiers

Weems & Plath Nickel-Plated Compass Chart Weight - 76 mm

The compass chart weight in shining nickel, for those who prefer a silver tone.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Brass Magnifier Chart Weight 5x - 76 mm

Weems & Plath Brass Magnifier Chart Weight 5x - 76 mm 2

Chart Weights & Magnifiers

Weems & Plath Brass Magnifier Chart Weight 5x - 76 mm

A brass chart weight with a 5x lens: holds the chart flat and brings tiny soundings into focus.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Crystal Magnifier 4x with Compass Rose - 76 mm

Weems & Plath Crystal Magnifier 4x with Compass Rose - 76 mm 2

Chart Weights & Magnifiers

Weems & Plath Crystal Magnifier 4x with Compass Rose - 76 mm

An optical-grade crystal magnifier with compass rose: clearer and more durable than acrylic.

Weems & Plath Grande View Magnifier 6x with Compass Rose - 102 mm

Weems & Plath Grande View Magnifier 6x with Compass Rose - 102 mm 2

Chart Weights & Magnifiers

Weems & Plath Grande View Magnifier 6x with Compass Rose - 102 mm

A large 6x magnifier that gathers light from all around: no focusing, no squinting.

Weems & Plath One-Hand Divider Brass - 7 in

Dividers & Compasses

Weems & Plath One-Hand Divider Brass - 7 in

The classic 7-inch brass one-hand divider, opened and closed with a single hand while you work the chart.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath One-Hand Divider Brass - 8 in

Dividers & Compasses

Weems & Plath One-Hand Divider Brass - 8 in

The traditional brass one-hand divider in the longer 8-inch size, spanning greater distances in one move.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Straight Pattern Divider Brass - 8 in

Dividers & Compasses

Weems & Plath Straight Pattern Divider Brass - 8 in

A straight brass divider with hand-sharpened stainless points and tension you can set yourself.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Ten Point Divider Stainless - 6 in

Dividers & Compasses

Weems & Plath Ten Point Divider Stainless - 6 in

An unusual stainless divider whose eleven numbered points split any span into up to ten equal parts at once.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Professional Brass Pencil Compass - 8¼ in

Dividers & Compasses

Weems & Plath Professional Brass Pencil Compass - 8¼ in

An extra-long solid brass pencil compass that draws circles up to 24 inches on large charts.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Parallel Rule Aluminium Arms - 18 in

Parallel Rules & Plotters

Weems & Plath Parallel Rule Aluminium Arms - 18 in

An 18-inch parallel rule with protractor scale, the essential tool for laying off courses.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Deluxe Parallel Rule Brass Arms - 15 in

Parallel Rules & Plotters

Weems & Plath Deluxe Parallel Rule Brass Arms - 15 in

A 15-inch parallel rule with solid brass arms and handles: traditional elegance for a classic tool.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Commercial Parallel Rule Chrome Arms - 24 in

Parallel Rules & Plotters

Weems & Plath Commercial Parallel Rule Chrome Arms - 24 in

An extra-long 24-inch parallel rule with rigid chrome arms, made for large charts.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Compact ParaLock Plotter - 7¼ in

Parallel Rules & Plotters

Weems & Plath Compact ParaLock Plotter - 7¼ in

A pocket-sized parallel rule with locking knob, designed to transfer GPS positions to a paper chart in seconds.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Weems Parallel Plotter - 12½ in

Parallel Rules & Plotters

Weems & Plath Weems Parallel Plotter - 12½ in

The most popular rolling plotter from Weems & Plath: roll it across the chart and it stays perfectly parallel.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath LIGHTrule Vessel Light Identifier - COLREGS

Navigation Aids

Weems & Plath LIGHTrule Vessel Light Identifier - COLREGS

A slide-rule guide that tells you in seconds what kind of vessel those lights belong to, and which way it is heading.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath LIGHTrule CEVNI - European Inland Waterways

Navigation Aids

Weems & Plath LIGHTrule CEVNI - European Inland Waterways

The LIGHTrule for Europe's rivers and canals, showing every light and signal under the CEVNI code.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath ROADrule CEVNI - Inland Navigation Aids

Navigation Aids

Weems & Plath ROADrule CEVNI - Inland Navigation Aids

A slide-rule reference to the marks, signs and rules of Europe's inland waterways.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath ROADrule IALA - Buoyage Regions A & B

Navigation Aids

Weems & Plath ROADrule IALA - Buoyage Regions A & B

IALA buoyage for both regions, with each mark shown beside its chart symbol.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath ROADrule USATONS - US Waters

Navigation Aids

Weems & Plath ROADrule USATONS - US Waters

A slide-rule guide to US aids to navigation, rules of the road and the Intracoastal Waterway.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Compute-A-Course Navigation Wheel

Navigation Aids

Weems & Plath Compute-A-Course Navigation Wheel

A compact plotting wheel for courses, distances and fixes, with a logarithmic scale for speed, time and distance.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Course & Leg Identifier for Search & Rescue

Navigation Aids

Weems & Plath Course & Leg Identifier for Search & Rescue

A search-pattern plotter that works out heading and run time for every leg, so the crew can concentrate on looking.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath VEC Vectormaster Circular Slide Rule

Weems & Plath VEC Vectormaster Circular Slide Rule 2

Navigation Aids

Weems & Plath VEC Vectormaster Circular Slide Rule

A two-sided circular slide rule for storm avoidance, current sailing and true wind.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Three-Arm Protractor (Station Pointer)

Navigation Aids

Weems & Plath Three-Arm Protractor (Station Pointer)

A professional three-arm protractor in clear acrylic for fixing your position from three marks.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Man Overboard Wheel - Williamson Turn

Weems & Plath Man Overboard Wheel - Williamson Turn 2

Navigation Aids

Weems & Plath Man Overboard Wheel - Williamson Turn

A two-sided wheel that guides you through man-overboard actions and the Williamson Turn when every second counts.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Gooseneck Chart Light 12 V Dimmable

Chart Lights

Weems & Plath Gooseneck Chart Light 12 V Dimmable

A dimmable 12 V chart light with flexible gooseneck and red lens to protect your night vision.

Weems & Plath NaviTote Navigation Tool Bag

Weems & Plath NaviTote Navigation Tool Bag 2

Navigation Sets & Bags

Weems & Plath NaviTote Navigation Tool Bag

A roll-up tool bag with ten pockets that keeps every navigation instrument in order at the chart table.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Elegant Navigation Set in Mahogany Box

Weems & Plath Elegant Navigation Set in Mahogany Box 2

Navigation Sets & Bags

Weems & Plath Elegant Navigation Set in Mahogany Box

Brass divider, parallel rule and compass in a lacquered wooden box: the finest gift for a new boat owner.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Primary Navigation Set

Navigation Sets & Bags

Weems & Plath Primary Navigation Set

All the basic tools for chartwork in one pouch: divider, parallel rule, slide rule and pencil.Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)

Weems & Plath Brass Clock Chart Weight - 76 mm

Chart Weights & Magnifiers

Weems & Plath Brass Clock Chart Weight - 76 mm

A heavy forged-brass chart weight with a quartz clock set in the centre, presented in a black velour-lined gift box.

Weems & Plath Basic Navigation Kit 316A with Plotter and Divider

Navigation Sets & Bags

Weems & Plath Basic Navigation Kit 316A with Plotter and Divider

Everything you need for basic chart work: Weems protractor, one-hand divider, navigation pencil and sharpener in a clear reusable case.

Blundell Harling Captain Field's Parallel Rule - 600 mm

Parallel Rules & Plotters

Blundell Harling Captain Field's Parallel Rule - 600 mm

Blundell Harling

A long British parallel rule in 6 mm clear acrylic with solid brass links and the classic Captain Field's double-reading scale, made for large charts.

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