I use colored twine. It can be a little tedious but in works great and lasts a long time.
I've tried plastic tape but the water and the stretching makes it wear off.
I know I have 100 feet of chain and I only mark the attaching line. Every where I like to anchor is usually around 20 feet deep.
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My son, the Marine!
"But a Constitution of Government once changed from Freedom, can never be restored. Liberty, once lost, is lost forever."