FINDU APRS logs are taken from the internet and contain those packets that were remotely received by IGATEs. When the beacons descend below the radio horizon for these receiving stations, they can no longer hear the beacons. That is why the FINDU logs end at 16k to 12k feet. APRS logs from the tracking stations can fill in these blanks. The KCØD flight log was recorded by the beacon and provides data on a one-second basis.