Not for sale - NOAA supplies them to the ship at no cost. It’s related to the paper form used on ships to code the synoptic weather. NWS Observing Handbook No. 1 has instructions to fill out the form and it’s available on-line.
Within NOAA there are two different means to take and record marine observations: 1. WS Form B-81 SHIP’S WEATHER OBSERVATIONS Paper form 2. AMVER/SEAS Software
Not sure but I think it’s the card used as a cheat sheet to fill out B-81
Seems like you are putting the cart before the horse, source for the answers before you know the questions.