Hi all!
I may have found the solution to use the arrows with peri, obs, uzo and binocular.
FIRST: make a backup of the file Commands.cfg
the path: Silent Hunter 5\data\Cfg\Commands.cfg
then in the Commands.cfg (not the backup

) whit a notepad you must place the following commands or only change if the commands already exist with these:
[Cmd80]
Name=To_left
Contexts=1,2,3,5,6,9,11,13,15
MnID=0x31000001
Key0=0x25,R,"Left"
[Cmd83]
Name=To_right
Contexts=1,2,3,5,6,9,11,13,15
MnID=0x31000003
Key0=0xb0,R,"Mouse L/R"
Key1=0x27,R,"Right"
[Cmd86]
Name=To_up
Contexts=1,2,3,5,6,9,11,13,15
MnID=0x31000002
Key0=0x26,R,"Up"
[Cmd89]
Name=To_down
Contexts=1,2,3,5,6,9,11,13,15
MnID=0x31000004
Key0=0xb1,R,"Mouse U/D"
Key1=0x28,R,"Down"
and save the file commands.cfg !
I tried this change and it seems to work. You can make a small mod to activate this new file commands.cfg with JSGME.
Torpedo