point 1 works fine with the LCX. GPS function as well as the heading sensor. You will know when the heading sensor is working, the little black boat triangle in the center of the screen will become elongated and turn red, kind of a neat feature.
I use a Point 1(actually the Simrad gs25, which is the same as the Point 1) with an LCX 27, works great. Standard NMEA 2000 setup.