I'll take a first crack at it and then send it over to Dr. Fuller.
I love that question, because it's so important. We need to know where these animals are. You'd think it would be easier than it is, but it's not.
Tracking devices have been used. There are some that go on the surface and can attach to the whale, but these whales seem to understand that they're on them and they hate them. They're violent and they rub them off. It only stays on for a couple of months.
Then there are those subcutaneous ones that can be used. The problem with right whales is that the blubber layer is only about eight inches thick. Right now, the technology is to insert the tracker so that we could see where they are. The tracker itself is about 10 inches long. It's just too big and they would cause infections in a population that is already under tremendous stress.
This is where I send out my SOS to Elon Musk. If he's listening, please get us a better tracker so that we can solve this problem through technology and know where these whales are. That would really help a lot of our problems.