Updating SSTs in Nesting Suite using OSTIA

Does anyone have any links to documentation about the process of implementing updating SSTs using OSTIA reanalysis? There’s an option in the nesting suite to do so, and I’ve made some ancil files that I think are appropriate by downloading OSTIA, but I can’t figure out what the surf_ostia2nwp app is doing or where to find any information on it.

Currently the suite u-dl933 is giving me some NaNs in the bigcstab errors that I know are linked to SSTs from OSTIA looking weird, but I don’t know how to fix it as I don’t know where the surf documentation is. Sorry if this is a silly question!

Cheers!