Tonnage length is measured along the upper surface of the tonnage deck, from the inside of the frames or sparring at the stem to a similar point right aft.
Umthwalo wenqanawa olinganiswa nee-athom ubude bumetwa kumphezulu wendawo yomthwalo yomgangatho, ukusuka ngaphakathi kwezakhelo ezikwingcambu efana nenkqaku langasekunene nangemva.