A stout cable amidships, between the spring lines, with a spliced loop on both end and secured with a lock onboard is likely to be far shorter and easier to handle than one on the bow.

A valve on the exhaust close to the through-hull serves to make the engine impossible to start, keeps pooping waves from swamping the engine, and may extend the life of the lift bend and exhaust manifold. Most slots in large marinas are difficult, if not impossible, to maneuver out of without use of an engine. The popular opinion us that most thieves would rather untie lines, start the engine and power off. Hoisting sail and active sail management is too much like work for most thieves.

It is also possible to remove the electrical links or fuses so that only one or two interior lights and the bilge pump/s will work. This makes starting the engine and otherwise stealing the boat much harder. It also goes a long was toward eliminating the risk of an electrical fire.

Key-lock switches can be inserted into the ignition circuits.

Most traditional hatchways are easy to break into. Stronger hinges and creative use of hasps, locks and latches can increase their security.