I just ordered the LCG4000 antenna along with the 124-69 - Lowrance Network Starter Kit. I was finding it too hard to "Zero in" on my waypoints I had marked and I believe it is due to the refresh rate of the "in unit antenna". I hope it helps at least $250 worth. I plan to mount the antenna right above my LSS-1 transducer.

I also have a Garmin GPSMAP192 C that I've had for quite sometime now. I guess I should break down and install that thing too.