A stable compass with excellent dampening, perfect for small boats in high speeds and rough conditions. The construction of the compass card with clear scales and rapid readability are advantages that make this compass excellent for high speed navigation and rough seas. The flat-bottom design enables flush installation without making large holes in the boat. A common configuration is two 85 compasses, one on each rail. The 85 and 85E are two different compasses. Please make sure you select in the options which model you would like. The integrated illumination makes the 85E suitable for night navigation (specific to the 85E model) 3 Lubber lines means no parallax errors - can be read from the side Flat-bottom design allows flexible installation - no need to make extra holes in the boat Memory ring allows setting of desired course