The webinar discussed the GPS clock rollover issue that caused YSI's H-2221 GOES transmitters to display incorrect dates in early 2019 and fail to transmit data. This was due to the GPS receiver reporting 1999 after rolling over from 2099, which the transmitter's firmware interpreted as the year 2099 instead of 1999. As a result, the internal clocks were set to January 1963 instead of the correct date. YSI provided firmware and software updates to fix the issue and prevent it from affecting transmitters with GPS chips that will rollover later. The webinar also offered tips for customers to update their transmitters.