This is the distance between the forward perpendicular (FP) and the aft perpendicular (AP). It is usually called LPP for large ships. For small vessels, this value is usually equivalent to LWL...
Ngumgama ophakathi kweepali ezimbini ezime nkqo engaphambili kunye negasemva. Ubizwa ngokuba yi LPP kwiinqanawe ezinkulu. Kwizikhephe ezincinci.