The refundable security deposit is a temporary authorization hold on your credit card in case of any additional trip incidentals (provisioning, fuel, gratuity, damages, etc.). Similar to renting a car or hotel room, Boatsetter places this temporary hold of funds (not a charge) on your credit card until the trip is completed and all costs (via the Check In form) have been submitted/assessed.
The deposit itself is not a charge, and most credit card companies will not show it in your statement, though some may show it as “pending”.
If there are no additional trip incidentals related to your rental, the authorization hold will be voided no later than 72 hours after the Check-In form is submitted. When a full authorization is voided, you may not see a corresponding refund on your statement, as the authorization was never charged.
However, if there are additional trip incidentals related to your rental, the amount of those incidentals will be emailed to you in your final receipt and will be charged from your security deposit. You will see a charge on your credit card in that amount. The remaining balance not charged will be voided, and there will be no corresponding refund that shows up on your statement, as the remaining authorization was never charged.