Again. All bands, all modes. Rest assured...they're properly equipped for overkill. ;-)
Matt, your responses on this topic make it seem like you have "inside information." Do you mean to imply that, or are you simply speculating & posting info (such as the nomenclature of that one VHF radio -- often clearly displayed on the show) as a fan of the show like the rest of us?
Unfortunately, I don't think they have a great OPSEC/COMSEC awareness, based on what I've seen on the show, and if that's true, it's likely that they don't have much of a SIGINT operation, though if they did, hopefully they'd keep that confidential. I think the reason they use Inmarsat & occasionally Iridium is simply because it's much more user-friendly than HF for voice & data. The Japanese whaling fleet(s) seem to have the support of the Japanese government. The Japanese government is certainly capable of monitoring non-secure or weakly-encrypted Inmarsat/Iridium in regions of the world they have an interest in, so their monitoring Sea Shepherd Conservation Society communications & providing sanitized intelligence to the Japanese whaling industry would be a reasonable course of action, especially when Japan considers the Sea Shepherd actions to be illegal and economically damaging to Japan.
One reason that sometimes some data (often GPS coords and time/date) is blurred out is simply because the producers edit footage around without keeping it in any sort of true continuity. A few times in the past where I've paid-attention to such details & paused high-def DVR images of some of the displays, RADAR images they want the viewer to think were taken moments apart were actually taken days or weeks apart. This is also true to other 'reality' shows like Deadliest Catch, et al.
Around 18 months ago, I sent the Sea Shepherd Conservation Society encrypted email using the public PGP key listed on their web page about OPSEC/COMSEC/SIGINT matters based on what I've seen on the show, & they never bothered to respond. Too bad.