A really small, but useful, outfitting thing that I did on my last boat is that I epoxied and fiberglassed a 1" diameter metal ring inside the hull beside and back of the seat. Now when I have the kayak on the car and have to leave it in a parking lot for an hour, or leave it at a campsite temporarily, I just slip a small chain or Kryponite cable through the ring then around the car racks (which are locked to the car) or around a tree at a campsite. This won't stop someone with bolt cutters, but it will stop the casual person who sees the boat and decides to snatch it.                   John (Waddington)

I have something similar inside my cockpit, and when I'm on the water, it serves as a place to tie in everything that I carry in the cockpit. Each item I regularly carry in my cockpit has it's own length of bungie attached to it (water bottle, hand pump, first aid drybag, etc.), and when I'm placing them in the boat, I tie them to the ring behind the seat. It only took one good spill in the surf, and a long walk up and down the beach to retrieve all my gear to convince me of the importance of securing each item.

(Melissa Reese)