OOC-General Chat
I am also assuming that John shares what he sees on shore for the sake of speeding up play a little.
In general, in my mind, when I give information like that, openly, that information will be shared, by default, without having to say so.
If there is something I imagine might not be shared I would specifiy this or send it privately.
Of course, if a player states their PC does not share something, then we go with that.
If anyone prefers to get all their knowledge secretly and then decide themselves what to share, that is fine, just tell me your preference.