I don't know what DSC means and I hate acronyms.
It would be nice if the OP stated in his first post what DSC means!
Acronyms and other code words (like so often used by some on this forum) can be a PITA (Pain In The Ass), but this one, DSC (Digital Selective Calling), has been around boats and boating for over ten years so I'm a little surprised you haven't heard of it.
One function, the ability to call your friends without hailing them on a common channel, I wouldn't give two cents for, but the ability to push a single button and have emergency responders know who and where you are and that you need help is priceless.
Three or four years ago, at my marina, I noticed a USCG (United States Coast Guard) RIB (Rigid Inflatable Boat) heading up the river towards my marina at high speed with ten people on board and lights flashing.
It slowed and pulled into a slip at the marina. They all jumped out and started talking to the owner of the boat in the adjacent slip.
It seems he had just finished connecting his VHF (Very High Frequency) marine radio to his GPS (Global Positioning System) and decided to test the emergency button (he claims his daughter did it).
It turns out, it worked very well.
Mine is connected and registered. Just like the seatbelts and airbags in my car and the PFDs (Personal Flotation Devices), I hope to never have the need to use it.