What is "kormchaia"

Kórmchaia Book, pl. Kórmchiye Books or Books of the Pilot (, Ко́рмчая from кормчий, mean helmsman, pilot of ship) or Pidalion ( from mean stern oar, helm, handle of helm, rudder) or Nomocanon ( from from νόμος means law, statute + κᾰνών means canon, rule) are collections of church and secular law (see also Byzantine law), which constituted guide books for the management of the church and for the church court of Orthodox Slavic countries and are transmission of several old texts. It were written in Old Church Slavonic and Old Russian.