Oceanography and GIS

Hi guys. I'm an undergrad currently doing a degree in Geography. I really want to go into academia in the future, and I want to specialize in marine science/oceanography.

Tbh I did not really know about all the fields of geography I could go into back in school so I didn't take up many science courses, which is pretty much hindering my ability to take a masters degree in a course that I like, due to all the science prerequisites. But I've still found a bunch of courses that I want to do.

Anyways, as a Geography undergrad I've done a few courses on QGIS and developed some skills in it. But I want to break into oceanography/marine science applications in QGIS. What are some resources I can use to teach myself the same? Any advice? If anyone has specialised in GIS and oceanography I'd REALLY appreciate some general advice as well.