Losing a GoPro because the sticky mount has failed is not a nice experience. I have been there. Using a leash or tethering system has become a key part of using a GoPro, especially when attached to a kayak, paddle or helmet. Since the release of the Blackout housing and GoPro Hero 4 the usual place to add a leash to tether the camera has gone.
GoPro have removed access to the metal bar that acts as part of the hinge, this was used by many to attach a thin piece of cord although some cases have failed due to this. There are two alternatives to using the hinge that depend upon the thumbscrew on the QR mount.
In certain parts of the world boat theft is a serious problem and given that most whitewater kayaks are close to £1000 it’s a pretty serious and probably very lucrative business.
My boat storage at home is pretty secure but I do feel that my kayak is at its most vulnerable when it is sat on the car. My current car has a roof rack that securely bolts to the car which means that it is fairly easy to lock my kayak to the rack and know that it is relatively secure.
I have used one of these really simple Playboater Rackguards for a few years. It’s great for quickly securing the kayak to either the cars roof rack or even the cars tow loop/wheel if the boat is on the ground.
The key is to wrap the cable around/through parts of the kayak that are hard to loosen off or remove. I like a loop around the seat pillar and through one of the rescue loops/handles as they tend to be fastened on using security bolts anyway.