Convoy Number
 

I searched for this information but was unable to find anything specific.

What I am wondering is, where does the convoy "number" come from. i.e. convoy "UC51"

The letters are designations telling the starting and ending point of the convoy. Apparently the numbers start at one:
http://www.convoyweb.org.uk/oskms/index.html

Click on the first 'clickie' at the upper right (OS.1-OS.31), you'll see all of that group.

Also see here
Atlantic convoys
http://www.warsailors.com/convoys/index.html
Arctic
http://www.warsailors.com/convoys/arctic.html

Prost!

Hi Cpt. Thomas. Not really sure I understand these, but I was wondering what a convoy number would be and where it might have come from if it is in Grid BE and heading toward the UK if it was October 1943 on a course ENE.

The only way for definate is to look in the rnd layer
Am not sure how accurate the convoys are scripted as regards to routes

Just click on the individual convoy. How about thisone.

CONVOY CU 5
Departed New York on Oct. 13-1943 and arrived Liverpool on the 24th.
Arnold Hague's "The Allied Convoy System" agrees with 19 ships in this convoy.
Transcribed from a document received from Tony Cooper - His source: Public Records Office, Kew.
All these ships were tankers, except Shooting Star, and they were all American.
CU 1 through CU 4 had departure port Curacao for Liverpool.
CU 5 started out from New York City to Liverpool.
CU 6 originated in Curacao again.
The rest of the CU series - CU 7 through CU 73 - departed from New York City.
For more info on the CU convoys, please see my page about CU 2.