I bought a Helix 7 GPS SI Chirp unit in Nov-- I got a good deal on a generation 2 Unit The Software for it was 1.64 -- the new Software 1.900 as of a couple of weeks ago. The newer the software the Better. then I found out why I got the good deal Bird had come out with Gen 3 and Gen 3N that can network with Other units --- Make sure you keep the Reciept - Proof of purchase and Reg the unit for Warranty -- I just had to send my unit back for repair and upgrade My unit was doing things it was not suppose to , And _Not_ doing other things it was suppose to I sent it off Friday and they Recieved Noon Monday -- E Mail says It will Be back here tomorrow