This exercise is used to run over one weekend in March. It involved the transmission and reception of serial numbers to as many stations as possible during set times. Normal operating hours were 1000 to 1600 on both the Saturday and the Sunday of the competition weekend. There were also morse and data sections outside these times which run in a very similar manner to the voice competition. All of the NRN frequencies were used and there were bonuses for communicating with the same station on multiple frequencies.This competition stopped running in 2014 due to issues with dates and the creation of Exercise Thunder Clap.