Asked by Ron Jefferson

How might scientists track humpback whales if they couldn't follow their songs
Answered by PsyDAG
Since we generally know their routes, how about sonar?
Answered by drwls
They can tag them with a small radio transmitter and track their position with a satellite.

See
http://green.blogs.nytimes.com/2012/08/20/a-whale-a-tag-a-mission/
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