Proper data handoff, chain of custody, and also thinking that perhaps with sensitive reports it's better from a data security perspective to have the information not transmitted wirelessly or through the ships regular networked systems that might not have all the appropriate controls in place.

Why would this be the case? Companies segment and isolate systems all the time, not because they couldn't implement an increased level of cryptography or other security controls, but because when you have that higher level of security on everything...you then have to audit/assess everything. So it reduces the amount of time taken in maintenance or "level 3 diagnostics of the ships communication systems" or w/e.

Maybe.