Ceramic sticks are useful for the final edge. They leave a surface that is almost polished. It is a bit coarser than the Viking whetstones shown above. I have two lengths, both about .368" (just under 3/8") in diameter; These would be easier to carry in the field than the plates. They are quite brittle, so some care is indicated.
AC-72 - 4 1/2"
AC-71 - 8 1/2"