import os
import struct
rowsize=99
binaryFile = file('gpsdr5.nat', 'rb')
while True:
      rowBinary = binaryFile.read(rowsize)
      if not rowBinary:
      	 break
      row= struct.unpack('<b 13f i 2f 2d h f i q', rowBinary)
      print row
binaryFile.close()