My 4×Gt-Grandfather John Kershaw was I believe merely a medical student in the 1780's when he went off as a "Ship's Surgeon" on one of those whaling ships to the seas around Greenland, sailing from one of the many ports on the NE coast of England. However he had a bit of a change of job description when, during a particularly violent and life threatening storm out there, he found himself down on his knees, praying for Divine deliverance.
The ship and its crew all survived, and he thereafter became an itinerant Methodist minister for the next nearly 40 years.
Keith