The ancient one twitches.
he thinks "i hate when i do that" and slaps himself with his mask he then grabs a mysterious scroll he grabs a bottle from his bag something green and gold and takes a swig.
he walks to the captains quarters and raps loudly.
he yells "captain can i come in i have a little something i've been working on"
the door is opened and he walks inside seeing the first mate who eyes the shape of his body suspiciously and shivers.
The ancient places the scroll on the table and unrolls it revealing it to be a map with only a circle of visible space around the harbour.
He says "you may not believe me but i created it in my lab it writes itself and requires no cartographer it will mark down land, monsters, important events that happen anything you want".
The captain looks disbelieving and surprised at the ancient one.
He twitches slaps himself and leaves.
The ancient one goes down to the crew quarters commandeers a bed and sets up his inscribing, scientific and alchemical equipment up.
he places the correspondence book next to the guide of red science gets into bed and falls asleep.
(i hope you don't mind my writing style it supposed to represent his fragmented mind)