"Bonnie Ship the Diamond

The Diamond is a ship, my lads
For the Davis Strait she's bound
The quay it is all garnished
With bonnie lasses 'round
Captain Thompson gives the order
To sail the ocean wide
Where the sun it never sets, my lads
Nor darkness dims the sky"

that is from
   http://www.pbs.org/wgbh/americanexperience/features/audio/whaling-shanty-bonnie/

I looked up Captain Thompson and got the following:

THOMPSON          DIAMOND               ABERDEEN       1819

from

http://explorenorth.com/whalers/features/whalecaptains2.htm


Now I am thoroughly confused.