Lewmar AutoAnchor 550 Operation Manual page 3

Windlass & Anchor Installation
The windlass must be installed according to the windlass
manufacturer's instructions with the correct size chain. The AA550
will not count correctly if the windlass is not standard (eg it is installed
with a different chainwheel or motor). It must also be regularly
serviced and lubricated.
For smooth operation, the windlass requires a good quality, properly
fitted bow roller and a swivel should be connected to the anchor
where it joins the chain.
Calibration and Testing
Before using the AA550 it must be calibrated to the windlass and rode
on the boat and tested in a safe environment.