The rubber duck tracking ... interesting. Maybe silly, but interesting, anyhow. I like the stories of messages in bottles - where they came from, how long the journey was, etc.
They used to dump out 1,000 bottle messages at single point time for same purpose. Probably still do.
Forgot to mention... that lot of rubber ducks did not vent... They all float, and are easy to spot. A normal rubber duck vents...
A 100 foot rubber duck caused a bit of confusion a while back when it was spotted on Google earth.
I am finding my knowledge of rubber ducks disturbing, on many levels.