Send each crew member their schedule on WhatsApp

From Manifests, send everyone on a day's trips their own WhatsApp with their trip, role, crew call, who else is on board and the notes, plus a button that opens the manifest.

Send crew schedule — beside each day on Manifests; you review every message before anything goes
Only what changed — press it again after changing the crew and only the people whose message changed get a new one
Says who it can't reach — anyone without a mobile number, or who hasn't accepted the WhatsApp invite, is listed with the reason