will the d2 nav disks work on a d1? i just want some upgraded maps for the new england region.... also i was curious if d2 disks will give me any extra features on the d1...

Yes the D2 will work on the D1. Beware of burnt copies though. That have been known to screw the units up. I do have an extra version 1.2 East map. Let me know if you are interested. I can ship it up. $40 via UPS next day.