398MB is the size of our JPEG?

It's possible to have currents and winds in different direction but it's generally limited to small area since the surface currents are wind driven. If it's the case, I'm not a sailor but I think the winds would be more important than the currents.

About your previous message, sorry I haven't seen it until today. I hope I'm not too late. I would say

R1 definitely
L1, unless you make a more gradual transition for L2.
C4 but at that size it just look like you applied a blur effect.