When saving a position on D 1.2, do I simply change the null to a number, say #28, then press save position? And if I want to do this for another satellite, can I repeat the process, save as #27, and not have it offset the first satellite? I don't understand the manual for the ultra lifetime or my SG2100 when it explains about 1.2 and then gives an example about a change that offsets all the satellites. Anyone care to explain it for me?