Ritchie B-51 Explorer Compass - Bracket Mount - Black [B-51] Brand_Speco Tech Compatible with instruments using the

Compatible with instruments using the NMEA language

instead of to the rail grip

If your Standard Horizon HX320 ever fails for any reason including water damage during normal use in the first three years

the 6187 has one single ratchet handle

Ritchie B-51 Explorer Compass - Bracket Mount - Black [B-51] Brand_Speco Tech Compatible with instruments using theExplorer Compass Features: 2 3 4 (70 mm) Easy to Read Direct Reading Dial Adjustable and Removable with Bracket and Thumbscrews Internal Green Night Illumination Built in Compensators to Easily Adjust for Deviation Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement Powerful DirectiveForce Magnets for Fast Heading Lock on Movable Sun Shield High Temperature Composite Construction for Extended Operating Range 100% Repairable