About Logbook
ARRL's Logbook of the World (LoTW) system is a repository of log records submitted by users
from around the world. When both participants in a QSO submit matching QSO records to LoTW, the
result is a QSL that can be used for ARRL award credit.
To minimize the chance of fraudulent submissions to LoTW, all QSO records must be digitally
signed using a digital certificate obtained from ARRL. Obtaining such a certificate requires
verification of the licensee's identity either through mail verification (US) or inspection
by ARRL of required documentation (non-US).
Software developed by ARRL can be used to convert a log file (in ADIF or Cabrillo file format)
into a file of digitally signed QSO data, ready for submission to LoTW.
LoTW began operation on September 15, 2003.
Page last modified: 09:07 AM, 20 Oct 2009 ET
Page author: logbook@arrl.org
Copyright © 2009, American Radio Relay League, Inc. All Rights Reserved.
