Cruise ID: RR2301 Multibeam System: EM124/EM712 Dates: February 4-19, 2023 R/V Roger Revelle (RR) underwent routine calibrations of the ship’s multibeam echosounders during an extended transit/cruise between Punta Arenas, Chile, and Cape Town, South Africa in February 2023; the MAC provided remote support for planning and data analysis leading up to and throughout the calibration Planning followed the standard MAC SAT/QAT checklist, focusing on calibrations at suitable sites within reasonable deviations along the transit route; these were completed in two phases with initial EM124 testing near Puntarenas, followed by EM124 re-calibration and EM712 calibration at suitable sites off Cape Town The initial EM124 calibration was completed with a TX array pitch error inadvertently held over from the 2020 EM124 and EM712 SAT; this was corrected for the second calibration, resulting in typically small adjustments During the approach to the second calibration area off Cape Town, an EM712 configuration error was