 with lots of missing data).

 Added capability to detect fly-away GPS points. Works in most cases, but
 may still miss a few fly-aways. Identified fly-aways are replaced with
 interpolation of bottom track (FLE 12-12-12)

 Rearranged the identification of bad values to use logical indexing,
 which is faster, and easier to trace (FLE 12-12-12)

 P.R. Jackson, USGS, 12-9-08 
 Last modified: F.L. Engel, USGS 12/12/2012</pre></div>

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