<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear Colleagues,<div class=""><br class=""></div><div class="">The USGS has changed the GNSS receiver and antenna at the Rocketdyne (ROCK) station. An updated site log has been submitted to the IGS Central Bureau.</div><div class=""><br class=""></div><div class=""><a href="https://files.igs.org/pub/station/log/rock_20210614.log" class="">https://files.igs.org/pub/station/log/rock_20210614.log</a></div><div class=""><br class=""></div><div class="">Data for June 11-13 (DOY 162-164) will be re-sent to CDDIS, IGN, and Wuhan University with the corrected RINEX headers.</div><div class=""><br class=""></div><div class="">Best Regards,</div><div class="">David Maggert</div></body></html>