A few years ago I thought about buying a used EPIRP that would require new batteries, re-programmed MMSI, etc. A friend who worked for decades in the marine electronics industry dissuaded me. His point was: "Look, this is a piece of life-saving equipment that you have to depend on. Get a fit-for-pupose unit with the best technology currently available; you don't want to die because of old or compromised technology". I listened. I am sure adding GPS and DSC to a handheld VHF is a good feature that may save a life, but if you are in trouble, would you rather rely on line-of-site VHF DSC technology or the right tool for the job? The right tool is a PLB that communicates directly with RCC through the COSPAS/SARSAT satellites. So, buy the handheld radio with DSC after you have a PLB and/or EPIRB. My $0.02.