A full service instrument shop specializing in sales and service of marine compasses. Suppliers of genuine replacement parts for Danforth, Aquameter, Ritchie, Kelvin White, Dirigo and Star compasses

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$18.00 5-LED LIght (Red)Tube with wireReplaces bulb socket and wire A14430$24.00 6- Bulb 12V 80-11$6.50 7-Wire and Socket w/o Bulb 147-4$12.00 11-Top Bezel Ring (Plastic) 163-54$31.00 14-Aluminum Clamping Ring 160-35-1$22.00 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$14.00 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$22.00 30-Expansion DiaphramThis diaphram measures 3-3/16" in diameter 160-1-1$34.00 31- Compensator Housing, Expansion RetainerNo Longer Available 160-50-5 32- Screw, Expansion Retaining 160-3$0.65 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 Screw, compass retaining screw (to Binnacle)Self Tapping screw, attaches compass to binnacle 37-A14942$0.85 COMPASS FLUIDCompass oil 11-Top Bezel Ring (Plastic) 163-54$31.00 Rebuilt 4-1/2" GeminiThe standard Gemini compass originally manufactured by Aquameter Compass Company, then manufactured by Danforth compasses as one of the Constellation series compasses. It is a 4-1/2" card flush mount compass that also will fit into most existing Gemini binnacle mount cylinders. These compasses are completely rebuilt with new clear domes, gaskets, diaphragms, pivots, jewels, fluid and compass bowls. They come with 12 volt red LED lighting and a two year warranty. Limited quantities A-180Regular price: $379.00Sale price: $325.00