All good, Josh and I onsite with Reva.
The first sonde we tried for the 10am launch had GPS problems after finishing ground check and taking the sonde outside. It would show that it was seeing 4 satellites for just a second or two, then back down to zero for minutes at a time. We tried a second sonde, which was fine.
For the 3pm sonde we tried the bad one from earlier again, this time no problems with the GPS.