I know this is a dumb question but I am still learning abou the Reef and CAN area.
What exactly do the cans represent? Are they marking certain underwater terrain or just deeper water for fishing/trolling?
The reefs are self-explanitory but the cans are still a mystery to me.

I fished B can for the first time last week with a friend (got 5 fish) and could not quite figure out what they are all about.