The SDV Lights are not visible on the PIP Monitor.
This is how it look in the drivers view
http://cloud-2.steampowered.com/ugc/576740932503141869/8151378B650C1D4570D19FDBC4DE113CE46E21BB/
And this is how it looks if you press Numpad http://cloud-2.steampowered.com/ugc/576740932503140111/658EAFE22B16C4FFEE2842AF6749E5966B5F1033/
It's not just the SDV, seems to be PIP all around. If you look at the dynamic lights at certain hours they will appear or not, ran a test earlier between 3 and 4 with two hunters.
One behind the other with lights on, I could see the cones but NOT the illuminated ground, however at 3 I could see the illumination just fine.
I don't know if it's the ground itself either, because a test in the SDV revealed that the ground would not illuminate but the rocks on the seabed would.
Mass closing ancient tickets with no activity for > 12 months; assume fixed or too trivial.
If this issue is still relevant in current dev build, please re-post.