Just to be clear znh, you don't always need a rear anchor. Crowded sandbars, its always a good idea.
In deep water, you only need one if your swing will cause issues. Its generally safer with one anchor, your boat will lie bow to the wind and change as the wind changes. If you read boating sites, you will see warnings about rear anchors.
With only a front anchor you will swing from side to side in the wind and may get close to a neighboring boat. You may also want to anchor the stern if the wind is blowing you beam to the boat wakes.
Just be careful if you leave a boat unattended with two anchors out.
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