moor, berth
舫 centers on securing a boat in place: tying it to a dock or anchoring it so it stays put.
舫 combines 舟 (boat) with 方, which likely contributes the sound and may suggest the idea of tying or securing a boat alongside.
A boat 舟 tied with a rope to a square post 方 on the dock: that's mooring.
For ホウ, imagine a boat moored at a dock, and the captain shouts 'Ho!' to signal the crew to secure the lines: Ho -> ホウ.