A lashing device is a rope, wire cable, or strap which wraps around the board and essentially ties it up with some sort of locking device. A simple low cost way to do this is to wrap chain around the surfboard and secure it with a lock.
A lashing device is a rope, wire cable, or strap that wraps around a surfboard and fastens it securely using a locking mechanism.  One easy and affordable way to secure a surfboard is to use chain and a lock.