Re: anchors
If your anchor is the proper size the number one cause of not holding is too short an anchor line. For best holding power you need a scope of 7 to 1. So in 16 feet if with the bow 4 feet above the water you need 140 feet of anchor line. In light current and winds you can add more chain and go as low as 3 to 1 but if the wind and current pick up then you need 7 to 1.
I think the best anchor out there is a Fortress. I have two anchor on my boat an 8 pound Dansforth and a 4 pound Fortress. My boat is 21 feet and 2800 pounds dry. The 4 pound Fortress digs in in faster and deeper. It can also be set for hard bottom or soft mud or sand. The anchor looks like a Dansforth but the flutes and sharp to dig in fast and the shank is thin to allow the anchor to did in deep.
Power boat mag and the Coast Guard both rated the Fortress as the best anchor.
Fortress is very light since it is made of aluminum so when setting anchor need to set a little different than a heavy anchor like a danforth.
To Lower anchor it is just like setting a danforth with one difference. Come up to your position to lower anchor, use reverse to gain a little stern way then take motor out of gear and lower anchor. When anchor hit bottom continue to pay out line in slow reverse until have proper scope. Tie it off and wet with motor in reverse like normal. The main difference is with the fortress you can not just put it in reverse and lower anchor. Since the anchor is light it may just troll in front of the boat from the current holding it up, so you need to stop in the water and allow the to settle to the bottom. After that in will dig in fast and deep.
One thing I really like is wife can pull the anchor with no strain at all as I have only 4 feet of chain. When it foggy and she can not see land to guide on she does not want to drive the boat up on anchor. She would rather pull it. With the danforth she just could not do it but with the Frotress it is very easy for her.
http://www.fortressanchors.com/testimonials2.html
http://www.fortressanchors.com/