Observer: ""Light Blue"(??) Officer William Guise-Tucker who was a Naval Chaplain..."

Yup... 2nd Gen. Royal Navy Blue Light Chaplain:

Blake, Richard, Evangelicals in the Royal Navy, 1775-1815 Blue Lights and Psalm-Singers, (Rochester: Boydell & Brewer, 2008)

Based on previous Northern Mariner & International Journal of Maritime History pubs. Good stuff.

I freely admit I do not understand the Mudcat-Wiki-Hugill shanty concept. I do claim some small, practical, working experience in the, admittedly lost, hard sciences of nautical proceleusmatics and telodynamics.

You won't do the math and you're struggling with basics like "trumpet" and "step."