In addition to the obvious clues, such as the company name and logo printed which would typically be painted obtrusively on the sailcover or hull, and the red roller furling which I wrote about before, the following is a tongue-in-cheek look at 10 other telltales that the vessel making their way along side you is a charter boat:
One of my favorite blogs these days is Zero To Cruising. Looks like blogger, Mike really put the cat among the pigeons (pun intended).
Oyvay, you have to read the comments. Go Mike!