Brunei Bay Radio is in SEAsia and monitors HF/SSB and provides other services.Dont use HF. For Maydays at all unless you afe right smack up bum against the USA or Australia.
one monitors it.
No one in Asia monitors it, i doubt if anyone in Africa, or South America monitors it.
But if you are in Chesepeake bay after a few hours someone may hear you.
Australia SAR services monitor HF/SSB.
Monaco Radio can be reached from much of the African East and West Coasts.
There are a lot of nets in Africa and SE Asia although they aren't 24/7.
HF/DSC provides the opportunity to reach commercial shipping.