Can someone else manage my listing for me?
There are no separate crew logins yet, so a shared operator account is the current answer. Use an address the right people can reach.
Plenty of operators here have an office manager or a partner handling bookings while the captain is at sea. Until separate logins exist, set the account up under an address that person can access.
Whoever manages the account can accept and decline requests, message guests, edit trips and change the calendar, so give access only to someone you would trust with the boat's bookings. Use a business email address rather than a personal one, so the account survives a change of staff. Requests and guest messages go to the booking email on the profile, which can be different from the address used to sign in — that is the simplest way to have an office see the bookings while the captain keeps the login.
Separate crew logins are on the list. When they exist, we will tell operators directly.