RadSim v3.1 has been released. The main new features are: support for RTTOV v13.1, option to compute geostationary satellite zenith and azimuth angles within RadSim, aerosol simulations using CAMS species based on ingest of aerosol fields from CAMS GRIB files, ingest of ICON cloud liquid and ice effective radius fields for use in VIS/IR cloud simulations, and optional writing/reading of footprint data to speed up certain kinds of footprint simulations. A full list of updates is available here.