Which of the following statements concerning Iridium satellites is true?
They are in a geo-stationary orbit, in order to provide true global coverage.
They provide coverage to vessels in all of the world's navigable waters including polar regions .
They are in an equatorial orbit, in order to provide true global coverage.
Vessels sailing in equatorial waters are able to use only one satellite, whereas other vessels are able to choose between at least two satellites.
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