Unless you boat in the only area that has a shoreline where its more than 100 feet deep right up to the beach....a deployed anchor acts as a drogue keeping your bow into the waves till you get into water shallow enough to have your anchor hold.
The sea anchor is really needed to keep you off a lee shore where the breakers would be farther out than your anchor would hold (usually storm or worse conditions) or the bottom is just so steep yo would never get to 3:1 or 5:1 before the boat would be in dangerous waters.
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