NAUI Wowie
Contributor
Yep. 406MHz signal straight up to the SAR satellites, while the DSC & VHF might get received IF a boat happens to sail near by you within a mile.
Also as I mentioned before, many liveaboards are now provide MRG for free loan to their guests.
So with the PLB1 it sounds like unlimited range and locations whereas about 1 mile for MRG hmm....