If I may, skipper - next time, Radar Depth, and give a couple of sweeps to definitely establish course and speed, plus it will help with identifying DD versus merchants, etc. Observation periscope, but use the <Insert> key to raise the scope just above the waves. It brings in more light, and since you're at roughly 45 foot instead of 62 for the radar, you won't need much of a rise to use it. The <Delete> key lowers it, or you can use the push button to bring it fully down. Between the radar and the Observation periscope, you might get enough info to actually attack with. That is all. Carry on!
A song that is overplayed, but is quite good still, and applies here... lol- Sorry, no Kerry Livgren, but... couldn't find a "Live!!!" video of Lonely Street either... nutz...