The currents are monsoonal origin and flow predominantly north-westward in December and January and south-eastward for the rest of the year. Rates up to about 1,5 knots may be met during the SW Monsoon and up to about 1 knot at other times. For further information see also Sailing Directions. OMISSION OF CERTAIN NAVIGATIONAL AIDS AND WRECKS Certain lights, buoys, beacons, rocks and wrecks have been omitted from this chart; for details of these, the large scale charts and the list of lights should be consulted.