If anyone is inerterested...........
I found a reason that the Uboat hydrophone shows as a "black screen".
Below is what I tested and found.
Mods are listed below;
MODS LOADED ORDER (JSGME)
TM - REL_SH4-ver15_TriggerMaru_Overhaul
TMO_ServicePack_1a
TMO_ServicePack_2
SUB - Snorkel Beta 1 with Type XXI conversion
SUB Uboat - No Hydrophone on surface
SUB UBOAT - SH4_1.5_ Uboat_freeCamFix
(at this point hydrophone shows) 
SUB - diverate
SUB - Skin Pack
MY MODS
ENV - Pacific Enviroments KRILLER 1_1Alpha
PERI - Maxoptics 1.4 over TM1.7
PERI - MAXOptics2 1.5 UBOAT over TM
(at this point the hydrophone screen does not show) 
Then after moving the;
SUB UBOAT - SH4_1.5_ Uboat_freeCamFix (here)
(at this point hdrophone shows again)
Looks as though the camera.dat file mods are causing some kind of conflict.
I hope this helps someone.
Joe 