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Milestone: NASA achieved GPS signals on Moon
(www.techexplorist.com)
This is a most excellent place for technology news and articles.
is it really such a huge deal ? Afaik "ballistic dead rekoning" is really, really accurate and isnt difficult to automate (it's mostly math after all)
For longer missions it helps to be able to re-calibrate, as with dead-reckoning, the errors cumulate