For 10+years, I've put my registration sticker on the transom rather than up near the bow where the lettering/numbering is displayed. My state (Massachusetts) clearly states that the sticker has to up up with the registration numbers, but in practice, I've had many a harbormaster, coast guard, etc. check in to make sure I had life jackets, etc... and never once had them complain about the sticker location. I've explained that "They just peel off the tubes up there", and they seem to have no problem with that answer. It is entirely possible that some day I'll meet up with a "letter of the law" guy, who won't be pleased, but... so far so good. Just make sure that sticker is up-to-date, and you've got adequate PFDs, etc... because you're more likely to get stopped when they notice that it's missing from the bow. (my two cents worth of advice)