Is it possible to turn on or off DCM100 NMEA 2000 transmitted messages (or PGNs)?

Yes, it is possible to turn on and off the DCM100 transmitted messages (or PGNs) using Maretron’s DSM250 display. On the display, enter menu mode, scroll to "Configuration…" and press enter. Scroll to "Device Configuration…" and press enter. Scroll to the row containing the DCM100 and press enter. Scroll to "NMEA 2000 PGN Enable/Disable..." and press enter. You will see a list of PGNs that the DCM100 transmits. Scroll to the PGN that you want to turn on or off and press enter. Use the up or down arrow keys to choose On or Off and press enter.