U boot soldbuch data..

[argan]

Hi!
I need your help to understand what is the meaning of "U.L.A.", or "U.A.A.", or "B.L.K.", that are many times reported into soldbuch.. (for example "U.L.A. Pillau" etc..)
I think they might be naval bases, but I cannot find exaustive explanations.

Thank you!

[Gerdan]

U.L.A. - U-Boot Lehr

Gerdannstalt

[Gerdan]

Sorry, I mixed something up.

U.L.A. - U - Boot - Lehranstalt

Gerdan

[Gerdan]

U.A.A - Unterseeboot - Ausbildungsabteilung

Gerdan

[Ian Jewison]

B.L.K. - Bau Lehr Kompanie - Construction unit for U-Boats.

/Ianl

[argan]

Thank you all for your help!

Have a nice day!