After testin today and aside from other prob in my other post in Lowrance,noticed the merc monitor doesn't read the speed after I swapped the LCX 28HD for HDS8...I did remove my old LGC 3000 puck and am using my internal antenna in the HDS8...guess I need it (LGC3000) back on to work??..I had no wiring change,just swapped out units..and installed LSS1...still setup on the merc monitor for GPS reading..is something diff or I need to reinstall the LGC3000?..thanks in advance...![]()