How to verify the ADAM GPS units are getting satellite lock via Gordon feedback

FYI, "ntpq -p" from aster is a good check of the network and GPS's. This shows
that all the adams are happy (with either a leading * or +) except for pressure2
which is getting its clock from the base.

[aster@aster ~]$ ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+profile.isff.uc GPS_NMEA(0)      3 u   22   64  377    2.426   -0.319   1.428
*downwind1.isff. GPS_NMEA(0)      3 u   47   64  377    2.540   -0.255   1.270
+downwind2.isff. GPS_NMEA(0)      3 u   58   64  377    2.555   -0.171   0.677
+upwind.isff.uca GPS_NMEA(0)      3 u   22   64  377    2.547   -0.141   6.876
+pressure1.isff. GPS_NMEA(0)      3 u   39   64  377    2.437   -0.257   0.375
 pressure2.isff. 192.168.13.1     5 u    2   64  377    2.538    0.126   2.289
 LOCAL(0)        .LOCL.          10 l   46   64  377    0.000    0.000   0.002