Funny how things evolve? DSC and NMSI showed up in the mid 90's. No one knew what to do with the stuff. Then 9-11 happens and we figure out how to shoe horn AIS into this standard and out pops something better than radar!
aiS isn't a function of 9/11. Its an anti collision
system that owes its genesis to work done in Sweden
and was adopted in Europe
first , well ahead of the US which is rather a late arrival to the scene , as it was for DSC
uses technology derived from DSC and in fact depending on systems AIS can be controlled on the DSC channels , it wasnt an addon to DSC , but a stand alone development.
DSC and the maritime identify idea really came out of GMDSS as a replacement for SOLAS ship or on scene orientated rescue
strategies. Today rescue
is shore based co ordinated. DSC was then over complicated in an attempt to remove dedicated radio