"Savaii" was equipped with a single ADF radio, but no VOR/DME/ILS radios (the latter would have been of no use in her new area of operations), and a pair of rubber 400-gallon ferry tanks (due to a plumbing fault, they stopped feeding after 770 gallons). She also had an astrodome, which was used to take sun- and star-fixes with an octant (bubble sextant).
The story of the flight is the last chapter of "Ernest K. Gann's Flying Circus" (ISBN 0 340 20693 4).