I am trying to diagnose my GPS. I am getting GPS Module not responding. I beleive I have a bad module but was looking for one to do some Diagnosis with. It has acted up periodically since I bought the boat new in 08. It completely stopped yesterday on Barkley. LMS520c networked with 522, E35 Temp, and LGC3000. The network is getting power because it recognizes the 522 and the temp sensor. Also have 12v going to the LGC3000.