Aids to Navigation: CU of twin chains being dragged on dock, TILT UP to tractor dragging chain in background. Shot of several chains laid out on dock, of tractor hooking onto one of them. Various shots of men repairing buoys, painting them, of large lift-truck rigged with crane moving buoys around. Several CUs of men at work fastening clevis of buoys being repaired, of winches turning. Shots of buoys being loaded on buoy tender "Chesterfield", being dumped overboard along channel. CUs of pulley and cable lifting load, of net full of floats being lifted, of hands steering wheel in wheelhouse. Several shipboard shots of buoy tender as buoys are dumped overboard. HASs of dock where buoys are being repaired.