Nautical flags

Flagpole seen in Siarö fortet, July 2015

During a stopover in Siarö fortet, we came across this flagpole with the series of flag on the left. Out of curiosity, I tried to verify what the flags were indicating...

A quick search on the Internet allowed me to decipher the first four: S I A R. But quid of the last flag? It had to be Ö as I was in Siarö. But this needed to be checked. The Internet did not provide insight. A search for Svenska alfabet did not find either a meaningful match. However, a picture search did find a few matches:

Puzzled, I decide to go to the Maritime museum in Stockholm to find-out... Tyvär, no way to find any information, nor anyone who has an idea. Until I get out through the shop, where one can find nice pairs of cufflinks on sales. Forget about Y and Z if you are Yves or Zoé. But if you are Åke or Ädla, you will be able to fin the proper cufflinks with your initials!

List of nautical flags

A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Ä
Ö
Å
0
Pennant 0
1
Pennant 1
2
Pennant 2
3
Pennant 3
4
Pennant 4
5
Pennant 5
6
Pennant 6
7
Pennant 7
8
Pennant 8
9
Pennant 9
Repeat 1
Repeat 2
Repeat 3
Repeat 4