What the wake looks like at 6 kts...
https://www.marineinsight.com/case-s...h-a-submarine/
@Onkle Neal: sounds great! Look forward to it!
When I'm attacking or maneuvering to get closer I lower the periscope until it is constantly under water then keep lowering for another 2-3 seconds or so. This allows for the motion of the boat and the wave action to clear the periscope while still being able to see under the water.
I always stop the boat before using the periscope when close to enemy ships unless I'm already looking at them in which case I'll raise, get a sight-picture, then lower it again. It's never above the surface more than a few seconds in that instance. I find it helps if the seas are not flat calm. I'll raise the scope so it keeps going awash for minimum visibility from the surface (again, while stationary).