Following actions shall be taken by OOW -
1. Inform Master if not already on bridge
2. Immediately stop the vessel and if required take all the way off
3. When underway but stopped - change the fog signal from the previous one prolonged blast to two prolonged blasts at intervals not exceeding 2 minutes.
4. Increase number of lookouts and change range on the radar and adjust so as to get the target details on the radar.
5. Increase the frequency of fog signals