the vessels have been named after historical locations, katanpää being an old island fortress and naval port outside kustavi in western finland, purunpää an old harbor site in dragsfjärd and vahterpää an old naval base outside loviisa in the gulf of finland. the same names were also carried by three of the four byms class minesweepers operated by the finnish navy in the 1950s. for the new class of vessels, the finnish navy has adopted a new prefix "mhc" which stands for "mine hunter coastal".