I have been using a anchor retrieval float system for the last year or more and get a lot of comments on my useage when out and about on trips , as did i several years ago when i learnt a few tips at gnaraloo where some ex cray boys told me they anchored at any depth to ensure sitting over schools of reds and rankins and was shown their device for retrieval rather than manual labour,( best option would be an electric winch of course) they simply had a large SS ring and float that attached over the anchor rope, you drive forward adjacent your rope and over the anchor position and the float runs back down the rope and lifts the anchor and chain of the bottom and back to to the surface,  then simply turn the boat around and retrieve rope and anchor whilst floating on the surface , theres a lot less labour required and i find this can be easily carried out when with wife or kids. there also is the safety factor as there is no need for your Deckie to be perched up the bow trying to yank up the anchor especially in rough conditions,  I use the device all the time and have anchored easily in 120 mts using a large grapple hook and 6mts of chain and retrieved with no back breacking exercise, there are a few units available , i have seen some units that have a large clip that tensions on the rope but prefer the large 120/150 mm ring and open clip with large float that allows the ring to go right down over the chain and holds the anchor  otherwise theres a chance of the chain and anchor sliding back down when your pulling it in of the surface, Happy deckie, happy boating !!