[GPS_Standard] GPS Receiver question

[k7hbg @dslextreme.com]

Hi Everybody;

 I have a Moto. R5122 Oncore receiver in use with Bert's controller board. I
was wondering if anyone
could tell me how many tracked "space vehicles" (you gotta love the jargon)
is needed as a *minimum* to assure
proper operation of the system.
 I would also like to know what is the maximum number of SV's after which no
difference is realized.
I was looking at the new oncore m12m receiver OEM module and thinking would
tracking 12 SV's yield
any more precision?
 In other words, how much is too much?

Best regards, Bob K7HBG