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Heads up for Recent ICOM M605 Purchasers
I bought an ICOM M605 in early April 2019 (serial # 11002439) and the DSC position reporting functionality didn't work (report and report request, receive and transmit). ICOM support confirmed it was disabled by default. Since this is US-only functionality, I'm guessing they forgot to change the defaults when they ran a US batch. ICOM support said any dealer capable of reprogramming the radio can change the defaults. Mine was done for free.
My M605 now outputs the information via NMEA2000 to allow my chartplotter to put a symbol on the chart when a DCS position report is received.