No it's not - how the **** can it be?
What's your problem?
If you see a life raft, I am assuming it is not there for no reason (being part of an RT practical test), and therefore someone else is in trouble, and therefore you are relaying a Mayday.....you yourself are not in trouble are you???? You yourself are not experiencing an urgency are you?
Fortunately - your opinion doesn't count, or we'd have numerous people relaying Maydays that they haven't heard.
So what would you do JAR boy? Declare a Mayday, Pan or just ignore the liferaft. I don't believe you have heard a Mayday either.....
Luckily your opinion doesn't count......The coastguard and anyone who matters will know what you mean, even if a JAA examiner doesn't.