Ma'anar ƙamus na "foremast" shine mashin gaba na jirgin ruwa. Yawanci shine mast ɗin farko wanda ke tasowa daga bene kuma yana goyan bayan sails a kan gaba. A cikin jirgin ruwa mai matsuguni da yawa, babban mashigin ya kasance mafi tsayi kuma yana kusa da baka ko gaban jirgin.