How far away is your GPS puck and what version of software are you using? I have both networked together using the same LGC-3000 unit. Both will work fine for several hours then they decide to lose position. I checked to see if it is picking up satellites and both are but position will still be lost. I can power one of the units off, doesn't matter which one, and position acquired with instantly appear and I will never lose position again unless I power up both units at the same time, but this will take a few minutes before position will lose again. Power off one unit instantly GPS acquires. Don't understand it. Any help is greatly appreciated.