The file I have is
New Narwhal K v 1.8.5
It says nothing in the download link about whether it is TMO2.5 compatible or not. Since it was made After TMO, I would assume it is. Am I correct?
This is my full mod list- The first "catastrophic" error I had occurred only after the last addition. I had 15 successful "full soup" patrols before that. JSGME seemed to add Narwhal just fine, and it appears in the list.
1_TriggerMaru_Overhaul_2-5
1_TMO_25_small_patch
RSRDC_TMO_V502
Fixed Zero Bomb Load RSRDC
LST_TMO_v2
RSRDC_V5xx_Patch1
Improved Stock Environment_v3_TMO&RFB
Submarine Hull Numbers
TDW_Ship_Plane_Fire_Damage_v1_3_SH4
Easier AI for TMO 2.5 by Orpheus
New Narwhal K v 1.8.5