Charts/Maps can be wrong. Also, under the water where you can’t see, features can change (e.g. sandbars). If you are the captain of a littoral combat ship, in today’s navy, would you be aggressive towards the enemy (whomever it it may be), or career-preserving and risk averse.
I’m not a fan or defender of running aground but I could see it happening say, running down pirates off the coast of Somalia, bad charts or new sandbars out to ruin your day.
C.W.
If a chart says the water is 10 meters deep I am going to assume the water is 8 meters deep and I would have some idea about the tides for the day.