A full service instrument shop specializing in marine compasses, weather instruments, spotting scopes, binoculars, telescopes, clocks, barometers, custom weather stations. Our service department is unmatched in the fields of compass repair, clock and barometer repair.

The Gemini compass (4-1/2" clear dome)was manufactured by Aquameter for many years until the Aquameter Compass Company was taken over by Rule Industries. The Gemini was marketed by Rule Industries for a short period of time, until it was modified and became part of the Constellation line of compasses. Most of the important parts are still available. The Gemini compass uses about 24 ounces of compass fluid to fill it. Click on the parts diagram to enlarge the image. Parts with prices are listed below by the key number in the diagram. gemregpart 1-Light CapNo Longer Available 160-28-1 2-Red FilterNo Longer Available 90-18 5-Wire and Socket with 12volt bulb 147-51$14.00 5-LED LIght (Red)Tube with wireReplaces bulb socket and wire A14430$19.00 6- Bulb (#53) 12 Volt 80-11$6.00 7-Wire and Socket w/o Bulb 147-4$12.00 11-Top Bezel Ring (Plastic)No Longer Available 163-54 14-Aluminum Clamping Ring 160-35-1$13.00 15-Screw (4-40 x 5/8")Uses 4 of these and 4 of # 16-171-11 160-8$0.36 16-Screw (4-40x3/4") Uses 4 of these and 4 #15-160-8 171-11$0.36 17- Nut (4-40) 160-13$0.48 19-Clear 4-1/2" Dome 160-5$44.00 20-Navigrid DiscNo Longer Available 167-1A-2 21-Dial 178-51-2$40.00 22-Lubbers lines Pan and Gimbal Ring Assy.No Longer Available 160-51-4 23-Lock Washer 160-7$0.36 24-Nut, Pivot Post 160-4$0.48 25- Weight- Pan Counter Balance 175-17-1$4.98 26- Oring, Dome 160-20$17.00 27-Bowl 160-25-2$41.00 28 Filler Plug Screw 160-14$2.80 Filler Plug Gasket SH-0039$0.95 29-Clamping Ring 171-8-1 30-Expansion Diaphram 160-1-1$31.00 31- Compensator Housing, Expansion RetainerNo Longer Available 160-50-5 32- Screw, Expansion Retaining 160-3$0.60 33-Binnacle HousingNo Longer Available 176-1-4 34- Grommet, Light Wire 147-15 35-Hole PlugNo Longer Available 165-7 36- Pedestal Adapter PlateNo Longer Available 176-2-2 COMPASS FLUIDCompass oil GETTING YOUR COMPASS REPAIREDViking Compass Repair Service specializes in marine compass repair. We repair compasses manufactured from the early 1800's to present day marine compasses. We are an authorized warranty repair station for most compass manufacturers, including but not limited to E.S.Ritchie, Danforth, Rule, C. Plath. We also repair compasses by: Aquameter, Star Compass Co, Marine Compass Co., Dirigo, Wilfrid O. White and Sons, Kelvin White, Kelvin Hughes, Wilcox Crittendon, John Bliss, Cassens and Plath, Baker Lyman, Lionel, Suunto, Plastimo. In January 2010 Viking Instruments purchased the entire inventory of Danforth and Aquameter compass parts as well as the tooling necessary to continue manufacturing replacement compass parts. Viking Instruments is the exclusive manufacture and distributer of Danforth and Aquameter compass parts and service. If you are interested in getting an estimate to repair your compass. Pack it up carefully and ship it to; Viking Instruments, Inc. 41 Summer St (Rte 3A) Kingston MA 02364 Please be sure to include your name, address and phone number with the compass. We will contact you via telephone or email within 2-3 working days from receipt of your compass. Most current production compasses can be repaired and be ready for return shipment within one week of the date of customer approval. If you wish to speak to someone in our shop concerning your compass you may call 781-585-2100 Monday- Friday From 9:30-5:00 E.S.T..Our retail Store is open Monday - Friday 12:00-5:00. Dealer Inquiries Invited.