The problem is that the antenna which is picking up the signal is stationary outside the building and all you are getting is that position amplified indoors. This is great for a demo where you need a GPS signal but does not really pinpoint your position inside of the building. Charles. At 03:03 PM 5/27/2004, you wrote: >Hi All > >I've read on various web sites about amplifying the received signal for use >indoors. Does anyone know whether any of these amps are serial and are there >any other issues which would make them incompatible with our software? > >Cheers > >Stephen Charles M. La Pierre CTO Sendero Group, LLC Lat. 37 15' 25" N Lon: 121 53' 04" W