I can see a problem with your NMEA
strings. There are no checksum. A "normal" NMEA
message should look like this:
$IIDPT,14.8,0.4,100.0*7A + signs for row end new line. (Compare my attached NMEA debug window) The "*7A" in my example is the checksum indicating a proper message. For some reason are these missing in your strings and therefor are your messages not handled by the Dashboard.
1) Check if your message sender, the NMEA converter, has a option to send with or without the checksum. If so set it to use checksum.
2) Uncheck "Control checksum" for your converter's connection in tools connection options, see image 2.