To throw out a marker and leave is wrong. To me you are littering and causing problems for other boater's props. It's like going to walmart and putting an orange traffic cone in a front parking spot so that you can come back later that day. Juglines are a different story because they are larger and must be properly marked by the owner. At least then, you can call the owner and gripe at them if it ruins your lower unit seals. I use markers also, but I never leave them so that others get the impression that I am "reserving" my spot. Sorry.

Yea it was me, and I took your markers too. I'll sell them back for a good price tho, as long as you don't mind that I already wrote my name on them.