By default, Orbiter 2010 does not have any bases on the moons of Jupiter, Saturn, Uranus, or Neptune. This very basic add-on simply puts a copy of Brighton Beach on 2 of the 3 moons of Neptune so that you have some kind of target to aim for when traveling to the Neptunian system.
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The base locations were carefully chosen to offer the best view of Neptune while landed at the base.
Since Nereid is so small (a bit like Phobos or Deimos), I recommend that you download the Nereid Mesh file from Orbit Hangar and use it in place of the default texture. This add-on puts a copy of dgatsoulis's Hall Base onto Nereid, but it will only look right if you have the Nereid Mesh.
So the requirements for this add-on are:
Hall Base by dgatsoulis:Â http://orbithangar.com/searchid.php?ID=5867
Nereid Mesh by Mr. Martian:Â http://orbithangar.com/searchid.php?ID=5869
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Otherwise, since these bases are just a copy of Brighton Beach, there are no additional textures or mesh files in this add-on.
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Please be sure to read the included Readme.txt in the Doc folder.