Ferries
Mariners are warned of frequent ferry crossings in the Singapore Strait and should therefore navigate with particular caution:- 
a) In the approaches to Sisters Fairway south west of Pulau Sakijang. 
b) In the entrance of East Keppel Fairway.
Ferries, travelling at speeds up to 16 knots, may also be encountered in the channel between Sentosa and Western Anchorage, in Buran Channel and in East Keppel Fairway.