GWX Question About BdU Orders in terms of "Area <letter>"

[promitheas]

Hello again guys, I'm playing a 1939 2nd Flotilla campaign, currently mid September, and this past (ingame) day Ive already got 2 reports which instead of mentioning grids mention areas. The first radio message is as thus:

Freedom of action to attack in the whole of Area F has been given

The second reads thusly:

U-30, U-27 off the North Channel in Areas U and V. U-30 also has permission to attack in Area V. U-53: Area B. U-28, 31, 32 Area C off the Bristol Channel. U-29 Area B, West of the Channel. U-26, 34, 35 Area F, West of the Channel. U-33 Area J.

Ive attached a screenshot of the second message. Notice how the From: line instead of showing BdU shows FdU? I reckon that is related. Regardless, what are these "Areas" and how do I know what part of the map they each refer to?

Many Thanks!

sh3_radio_areas.jpg

Edit 1: Just thought of another question and there is not point creating a whole new thread as its related to radio messages. Basically the age old problem of getting constantly interrupted when transiting under TC by radio messages unrelated to my mission. All thread I've read recommend using WB's Mission Orders Lite mod to limit radio messages while at sea, but (correct me if I'm wrong) the mod is not present in the files at the link provided. I clicked the link and searched using my browser's Find functionality for "Mission", "Orders", "Lite", and got not results. Does anyone know how I can achieve this effect?