Does your DSC-enabled radio know who you are? Of course, no rational person would overlook entering an MMSI and connecting to a GPS receiver, but of course, they do, especially recreational boaters.
Warns the US Coast Guard:
As the US Coast Guard’s new marine radio network Rescue 21 becomes operational, rescue centers can now receive instant distress alerts from commonly used DSC-capable VHF marine radios. However, approximately 90% of VHF DSC distress alerts received by the Coast Guard do not contain position information, and approximately 60% do not contain a registered identity. The Coast Guard cannot effectively respond to a DSC distress alert sent from such a radio.