(Replying to PARENT post)
To be fair, they are Vikings, which probably counts as both pirate and terrorist, though I'd say it is a bit of a delayed response as the Icelandic haven't gone a'viking in simply ages.
As an aside, I have run into a few people recently who claim to be both vikings and anti-immigration, which I cannot help but find really funny.
(Replying to PARENT post)
It's much more practical for figuring out where ships which have their transponders turned off are.
Same goes for current generation state of the art optical satellite data, which is mostly useful for pretty pictures and environmental trends, but might be just about enough to prove you didn't park your car where you said you did if you're really unlucky. (This, admittedly, is the bit that might improve rapidly in ten years, but it's still not going to be particularly useful for targeted tracking of individuals, never mind dragnets)
(Replying to PARENT post)