dolphin mark and seal mark are pretty similar.
a shark the same size gives a diff mark
a wsb also gives a diff mark (squigly line... worm.. snake...)
a yt gives a very nice arc (especially if you have your chart speed increased)
big floating blobs is usually baitball. sometimes too small to hook
big floating blobs WITH ARCS under/around them... you want to target those arcs. they are big fish chasing the bait ball.
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