I don't know.

STL comms has the advantage that it's easy to compare timestamps on the signals and get an accurate position. When Earth is 2 light minutes behind you, Mars is 3 minutes behind, Atalante is 5 minutes behind and Jupiter's fifteen that's good enough to figure out where you are. You don't need to send much data, just enough to carry a timestamp. It should be possible to receive anywhere within the solar system.


That said, star-sighting was good enough for Apollo.

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--m(^0^)m-- Wot, no sig?