Here is screen grab of an F9T tracking GPS/GLONASS/GALILEO/BEIDOU.   In the max 
sig level display the sats that the F9T says do L2 ionospheric corrections are 
shown in GREEN.

Note that the F9T thinks that it is seeing signals from PRNs 192..202   These 
are the Japanese QZSS sat PRNs.  Obviously, these are not visible from the USA. 
  I'm not sure why it thinks it sees signals from these.   Perhaps its 
correlators ate tricked by signals from other sats.   It never actually tracks 
them.

---------------

> On the F9P you have the specific issue of L1 / L2 with older GPS satellites. 
> The device
only does L2C. That cuts the “population” roughly in half.
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