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New and Used Sextants

Why we love sextants
  • For their role in trade and exploration. For centuries navigators depended on celestial navigation for finding their next landfall. These instruments brought mariners to adventure, to wealth, and home again.
  • For their precision. Most modern sextants, properly adjusted, can put the experienced celestial navigator - assuming no error in timekeeping or computation - within a couple of miles of the actual location.
  • For their simplicity. There are just two moving parts, two mirrors, and a frame with a handle. Everything is bolted together. Easy to understand, easy to clean.
  • For their perfection. There have been some refinements but no major improvements to the general design of the sextant for many years. They are at or near the zenith of their design evolution.
Instruments we offer
  • We offer new Cassens & Plath and Astra IIIB sextants.
  • We also offer a large selection of reconditioned sextants. Some of the instruments shown below may still be available; some have been sold. We specialize in offering Plath sextants and Tamaya sextants, in very good to excellent condition, built in the past few decades. Both are tops in quality. We occasionally have English sextants, U.S. Navy Mk II sextants, and now and then an octant.
  • Since our stock of sextants changes often, please email or call us so that we can send you the most up-to-date listing promptly.
  • For traditionalists we also offer Thomas Walker taffrail logs, both the Excelsior Taffrail Log and the Knotmaster Taffrail Log. Please see these listings under Taffrail Logs (at left).
Why our customers love us
    We are finicky in acquiring pre-owned sextants: we buy the best. And we buy only those which are in at least good condition. Then we overhaul them, making repairs, adjustments, lubrication, and cleaning. And very important, our policy has always been to be fair in pricing. If you wonder if the price is fair, ask yourself the value of the following:
  • Our 30-day money-back guarantee: we insist that you be satisfied with your purchase, or you can return the sextant and we will refund the purchase price. You canít be sure of this with an eBay purchase!
  • Our 50-year reputation for honest representation of all merchandise
  • Our ability to service almost any problem with any sextant, with expert attention and the nationís largest supply of Plath and Tamaya parts
    All instruments listed will not leave our premises until they are in A-1 working order. The instrument will have been cleaned, lubricated, and adjusted. The mirrors will be new, or resilvered and like new. With basic care the instrument will work like new and last for many years.

Sextant Parts

Looking for a part for your sextant? Give us a call. Years ago we acquired all of the sextant parts for C. Plath and Tamaya sextants from Weems & Plath in Annapolis. They had decided to terminate their sextant service, and we made a large purchase that enabled us to expand our sextant repair capacity.

Recently we purchased a very large collection of sextant parts from the estate of Maryland Precision Instruments. This collection includes parts for C. Plath, Weems & Plath, Cassens & Plath, Tamaya, Astra, U.S. Navy Mk. II, MAC, Heath, Hughes & Son, and other manufacturers. We believe we have the largest collection of sextant parts in the United States.

In brief, it includes index and horizon mirrors, mirror frames, pentaprism assemblies, adjusting tools, some scopes, filter assemblies, micrometer components, handles, lighting parts, handles, a large variety of screws and fasteners, etc.

If you are looking for a part for your sextant, tell us the manufacturer and model. We will check our inventory and get back to you. Call us at 617-482-8460.

Sextant Service

Sextants are very personal tools, and your sextant means a lot to you. If you are considering having it serviced, you should know the following about Robert E. White Instruments.

We have serviced countless sextants over the years. Who comes to us? Yachtsmen, cruising skippers, and young and old people learning the art. Over the past three years the U.S. Coast Guard cutter EAGLE has sent us a total of 45 sextants for service. These sextants are used for training cadets in celestial navigation on cruises, and the sextants sometimes suffer from a lot of use. We have provided parts, cleaned and lubricated moving parts, and performed a careful adjustment of the mirrors, all within a time frame and within budget.

What does service cost? It depends, of course, on what is needed. A routine cleaning, lubrication, and mirror adjustment usually runs under one hundred fifty dollars. Mirror resilvering or replacement is additional. We will give you a free estimate before doing any service, and you can tell us how much to do. You control the cost so there are no surprises. Our work is fully guaranteed. We have a superb reputation and do our very best to continue earning it with every sextant we service. Call us at 617-482-8460.

Celestial Navigation
Astra IIIB

Our Price: Click to See
NEW Cassens & Plath
Highest quality for those who insist on owning the best.

Our Price: Click to See
Cassens & Plath Standard Sextant (Bremerhaven) )
Sextant #29367

Our Price: Click to See
Cassens & Plath Horizon Ultra Sextant (Bremerhaven, 2005)
Sextant #40734

Our Price: 1250.00
Tamaya Spica MS-733 Sextant (Tokyo, 1979)
Sextant #41972

Our Price: 1200.00
C. Plath Sextant #42961 (Hamburg, 1962)
Sextant #42961

Our Price: 1100.00
C. Plath Sextant (Hamburg, 1966)
Sextant #48015

Our Price: 850.00
Weems & Plath Sextant (West Germany, 1978)
Sextant #61125

Our Price: 1100.00
Weems & Plath Sextant (Germany, 1978)
Sextant #61245

Our Price: 900.00
C. Plath Navistar Professional Sextant (Hamburg, 1979)
Sextant #71190

Our Price: 950.00
Freiberger Drum Sextant
Sextant #720218

Our Price: 700.00
TI-T89 StarPilot
Navigation Graphing Calculator

Our Price: Click to See
Star Finder
Celestial navigation becomes easy.

Our Price: 48.99

Robert White Instruents

Prices and specifications are subject to change without notice.

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Robert E. White Instruments, Inc. | P.O. Box 775, Medfield, MA 02052
Tel: 800-992-3045 (U.S./Canada) Tel: 617-482-8460 (Eastern MA) Fax: 617-482-8304
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