NO....do not do that!
Unlike VHF antennas, SSB verticals belong down close to the water, like on the transom.
Why are you choosing to use a vertical (whip) antenna, anyway, if you have a sailboat with a 47' mast?
You might want to investigate either a traditional backstay antenna or an "alternate backstay" antenna, both of which would likely outperform the vertical on many bands -- and, you'd avoid having a whip antenna flopping about in a seaway.
What kind of boat do you have? What are your intended cruising plans?
What kind of radio? Tuner?
What are you planning for an RF ground?
BTW, congratulations on your new ham license!