It's where fish go use the bathroom ..that is why there are dark marks there..... Everybody knows that!!!
So you are reading the beach ehhh ??? Are you planing your attack by air??? Is your your recon photo up to date, or did you just fly your drone over it? I sure hope you have a tactical advantage and your Intel is up to date so you cwan snweek up on thwose wascally fwish... Sorry I just couldn't resist..
Seriously....It changes all the time especially here..storm surge, tidal currents etc. Walk or ride down the beach and look for sandbars, holes, cuts, or troughs... Watch a few videos and/or go with someone who knows how on how to read the surf.