"turned in my notice" means he told his employer; "i quit..i'm going sailing"
or as johnny paycheck sang..."take this job and shove it"
colloquialisms and all...
By three methods we may learn wisdom: first, by reflection, which is noblest,second is by imitation, which is easiest,third is by experience, which is the bitterest.
Sanctuary, Sabre 30 mkIII