RE: Multiple DSC radio operation
And please realize that DSC is not just for emergency purposes. It is a valuable tool in contacting known boats and switching them to a channel of the caller's choice without having to go through the tedium of hailing and agreeing on a channel. THAT prevents unnecessary radio chatter that actually could interfere with an actual emergency. I have heard an emergency alarm exactly once since DSC proliferated. I have heard numerous emergency calls!!!
The problem with entering the same code into two radios is you have to chase down the other radio to get it to quit alarming. And if you choose to have unique MMSIs, make sure you install the radios in a way that you can determine which one is ringing. We have a buddy that has two identical radios installed one on top of the other and he goes mad trying to figure out which one is ringing...lol.