Hi all, Was doing some snooping on some of the arduino libraries available. If the chip is aware of it's lat/long and time, via gps, how difficult would it be to calculate the AOS/LOS of the ISS? Given is an appropriate TLE set, of course. Norm n3ykf _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb