blue bars in the UZO and binocs?

[She-Wolf]

Hello again boat-mates ( well they aren't SHIPS are they?). I have a gentle query. Have started SH5 again, and am trundling up the Kiel Kanal at present, on my way to kick, err, bums, in the North Sea, if I am lucky. To pass the time I am up on the tower watching for kamikaze boats, admiring the fluffy clouds, as they slowly drift and change ( wonderful), look at the passing buildings - you get the picture - but then I see two anomalies. One is that on a couple of occasions, as I turn to look behind, the clouds there are more like a big black dust storm on the horizon, and then they morph into normal clouds - I guess that is to do with my graphics card. The other though seems to be in the game. When I look through the UZO or the binoculars at some boats moored to the side ( but not all, just one or two), they have a blue and white bar above them. What is this please?

Slightly different tack. I have looked at the mods, lots of them, and will surely make use of a number, but there are so many, and I am not quite sure where to look to find the exact mods for my initial small wish-list, if indeed it is a mod I need, so I thought I would ask
I did want a clock, but now I see I have the time on the scrolling comments at the right hand corner, so that will do the job I spose.
I also would like to have German speaking voices, for the sake of realism, and expect there is an option for that, but seem to have missed it if so.
I would also like the water to be less black than it appears - unless that is simply because the day is somewhat overcast. Thank you, thank you, thank you, in advance.