So why should our usage be different.
Because they have time to plan their exit. Leaving a boat, you might have time to climb the rail while still holding onto the gadget. Who can say what the situation after a ditching is going to be? And a yottie is likely to be uninjured when entering the water.
Maybe the best way of using a Fastfind is to install it inside the liferaft. A rather 'eggs in one basket' solution!