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Our services include cleaning, lubrication, and calibration (mirror adjustment).  We have a large stock of replacement parts for many models, especially C. Plath, Cassens & Plath, Weems & Plath, Tamaya, Freiberger, and Astra. We have a limited supply of parts for other models.

Mirrors:  We regret that we are no longer able to offer resilvering of mirrors.  We do have new, first-quality replacement mirrors for the brands listed above.  We have a limited supply of mirrors of odd sizes for other sextants.  Contact us after measuring (in mm) the size(s) you need.

The U.S. Coast Guard regularly sends us sextants that have been used aboard the “tall ship” EAGLE for training Academy cadets during their summer cruise.  Other clients include Massachusetts Maritime Academy, the U.S. Navy, passage-making sailors and others interested in preserving a family tradition.

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USCG Tall Ship Eagle

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If you bought a sextant on eBay and wonder if it needs an inspection or tune-up, or if you came across your relative’s sextant in a closet or attic and want it restored to good working order, talk to us. If you’ve had a sextant for years and want to pass it along to another generation, let us refurbish it for you.

How to ship your instrument - safely!

  1. Pack your instrument carefully. Use an outer carton big enough to allow ample cushioning inside. Crumpled newspaper works very well.

  2. It doesn’t matter whether you choose UPS, FedEx, or Priority Mail. What matters is how well you protect the contents.

  3. Enclose a note with your contact information and any specific questions or instructions.

  4. Ship to: Robert E. White Instrument Services62 Washington Street, Marblehead, MA 01945


What happens next:

  1. We receive your package, examine the contents thoroughly, make a list of recommended service and estimated costs, and then we notify you.

  2. You tell us how much you want us to do.

  3. We do what you ask and then contact you to say it’s ready to return to you.

  4. You give us a credit card or send us a check. Within 24 hours of receipt we ship your repaired instrument back to you, by Priority Mail, with our guarantee of satisfaction.

You can reach us at,

or by calling 508-359-7467 (note, this is a landline and cannot receive texts).

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