Found this on the c/n site. Maybe a cheaper alternative for Dob owners. Its no Argo Navis and you still need a PDA to get the info but it may be just a toy or according to this user it does work so if you have a PDA it might be handy but the PDA could also wreck your dark adaptation.
http://www.cloudynights.com/ubbthrea.../o/all/fpart/1
Regards Matt.
