Their email or username. They get a friend request and choose to accept. Not on CruiseChattr yet? We email them an invitation.
Everyone who joined the same sailing and chose to be listed. Children and crew are never listed.
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Ten digits. Someone giving you their code is agreeing to hear from you, so you are connected straight away.
Give this to family at home, or to someone you met aboard. Anyone holding it can reach you until you change it.