We have tested many, many sharpeners and this one appears to meet all of our requirements and it has stood the test of time.
It fits into a compact handy case that protects all of the sharpening components
There is a carbide V groove for knives that are really dull and the edge has to be returned quickly.
The flat diamond stone quickly returns a sharp edge. For use with line, many sailors stop after the diamond stone because of the fine toothed edge.
There are ceramic rods for the sailor that wants and appreciates a polished edge that can be honed to razor sharpness.
For serrated blades, the ceramic rods feature small v’s on the ceramic rods for the small serrations and rods for the large “loops” or serrations.