Hello to the group,

1. I am wondering whether the new gps signals will replace the oldies.
e.x. when the l2c will be operational ready will the classic l2 signal
stop transmitting? In 2015 when the l5 will be active
what's the reason of having the new satellites transmitting old weak
signals? (except of backward compatibility with old receivers)

2. what's the critical number of l2c transmiting satellites for seeing
the first results in high accuracy applications? i think now 6 are
operational.

Theseus