Do you use a drop weight that you can detach from your belt, which anchors the float to the seabed so that yoiu can dive around it, and then recover it an re-attach to your belt before you move on?
Gaz,
I used a drop weight although I prefer to use a karibiner to attach to my belt as sometimes the weight slips out. The one I use does not anchot as such, it tends to just hold the weight in a position but can move around slightly - Dave Spearo does them in yellow.
Stay Safe
Diver9