Isos from lotw arrl
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. Log on to Logbook of the World. Note: You must have been issued a certificate before you can log on to the LoTW site. Is LoTW Secure? To minimize the chance of fraudulent submissions to LoTW, all QSO records must be digitally signed using a digital certificate obtained from ARRL.