I have a Solix 10 that is hooked up to my NMEA network and I am using the Lowrance Pt 1 for a heading sensor. It is also hooked via ethernet to my Ulterra. I am only using it for mapping so no transduer is connected to it. The Ulterra has a Low. total scan ducer on it. My Solix keeps showing the depth and is very close to the depth showing on my HDS. Can it possibly be getting the info from the HDS via NMEA? If no then how can it show depth without a transducer?