St. Mary's County's 800 mhz system uses EDACS for programming. Whenever a patient is flown out, they patch the MSP (or Medstar, whoever is flying in) helo into the units on the scene. However, when the patch is put up, I can't hear it over my scanner. I know for a fact the patch is readable to scanners, because the online scanners pick them up. Is anyone familiar with what talkgroup ID the patches operate on? Any help would be appreciated. Thanks.