Originally Posted by watersidemat
im sure a black bucket on a mopstick or mooring hook tied to the a frame would suffice.
Both useful objects with a double purpose.
An anchor ball should really be in bow. A bucket above the A frame is going to look closer to one of the other dayshapes.
While people are not going to mistake your RIB for a vessel constrained by draft, that is the message you will be sending out ( i.e. a black cylinder displayed in a prominent position,as opposed to a black ball in the fore part of the vessel).
The black ball is not that practical for a lot of RIBs and small powerboats but I have seen a few boats that have custom designed a small pole/ball solution that can be easily attached/removed from the bow.