--- Level 0 filtering performed on nav1997028vnta.txt at 05/20/100 03:02:09 ---

Level 0 Filtering Rules:
 * Fields identified in logger files as Not Available (NO_ITEM,
   NO_PROV, blanked, etc.) are set to 0 and flagged 1.
 * Altitudes less than or equal to 0 or equal to 60 are flagged 2.
 * Pressure values more than 20 away from the median value of the 10
   surrounding points, 5 before and 5 after) are flagged 2.
 * Position (Lat/Lon) outliers (identified in groups of 4000 outside of
   SD range of 2, then in groups of 180 outside of SD range of 2, then
   in groups of 4000 outside of SD range of 3) are flagged 2.

File size:         12137 rows
Positions Flagged: 1842
Pressures Flagged: 52
Headings Flagged:  0
Altitudes Flagged: 12137
Attitudes Flagged: 0
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