gistfile1.py

#!/usr/bin/env python

import datetime

from igc2kmz.igc import IGC

garmin = IGC(open('blackheath_blackville_garmin.igc'))
compeo = IGC(open('blackheath_blackville_compeo.igc'))
g_track = garmin.track()
c_track = compeo.track()

# If the time of the compeo tracklog is within +5/-5 seconds of the time of the
# garmin tracklog, then use the compeo height
for i,t1 in enumerate(g_track.t):
    for j,t2 in enumerate(c_track.t):
        if t2 >= t1-5 and t2 <= t1+5:
            dt = datetime.datetime.fromtimestamp(g_track.t[i])
            # Only use values which aren't bogus
            if g_track.ele[i] <= 3048:
                # HHMMSS LAT LONG 'A' 00000 00ALT
                print('B%02d%02d%02d%sS%sEA00000%05d' % (dt.hour, dt.minute, dt.second, garmin.o[i]['lat'], garmin.o[i]['lon'], g_track.ele[i]))