In Indiana, all watercraft must be titled except for the following:

Watercraft purchased prior to January 1, 1986 until after the watercraft is transferred to another person. If ownership has transferred since January 1, 1986 the new owner must title the watercraft (unless the watercraft is exempt from titling for another reason).
A ship’s lifeboat.
Non-motorized watercraft of any value.
Watercraft valued at less than $3,000 when new.
Assembled watercraft of any value built for personal use and not for resale.
Watercraft documented with the United States Coast Guard.
Watercraft legally registered by an out-of-state resident temporarily operating on Indiana waters for less than sixty (60) consecutive days.
When a watercraft is required to be titled, the title must be applied for within thirty-one (31) days from the date of purchase or transfer. If you are buying a watercraft, ensure that the seller has signed the appropriate section on the watercraft title, completed the purchase date and selling price fields, and filled in your information as the watercraft purchaser.

You must present one (1) proof of your Indiana residency when titling the watercraft. If your address has changed, you must present two (2) proofs of Indiana residency.

If you do not have a valid Indiana driver's license, learner's permit, or identification card you must also present proof of your Social Security number or I-94 and Social Security Administration ineligibility letter.