# Print start/top times of gaps in 1 Hz GPS data. 
# First column of input is epoch seconds.
BEGIN {
    minGapSec = 120;
    printf "# GPS gaps exceeding %d seconds\n", minGapSec;
}

prevTime > 0 {
    delta = $1 - prevTime;
    if (delta > minGapSec) {
	if (delta > (3600 * 24)) { 
	    prevTime = 0;
	    next; # Ignore gaps exceeding one day
	}
	cmd = "et2ut " prevTime;
	cmd | getline prevUTC;
	close(cmd);
	cmd = "et2ut " $1;
	cmd | getline UTC;
	close(cmd);
	printf "%d  %d  %d - %s, %s\n", prevTime, $1, delta, prevUTC, UTC;
    }
}


{
    prevTime = $1;
}