TECHNICALThe 420 is an established performance two person trapeze and spinnaker racing dinghy and there are approx. 56,000 worldwide. This popular dinghy is sailed at school, club, open, national and international levels in Fleet and Teams Racing. The 420 is sailed at the ISAF Youth World Championships and a youth development boat in 43 countries. The 420 is used for the World Teams Racing Championships and now for teams racing at a secondary school and inter club competition level in various countries. The 420 is a popular class worldwide due to its all round performance and these multi-use attributes.
For a comprehensive guide to all aspects of 420 sailing, class rules and ISAF 420 rules, go to the British International 420 Class Association technical information page. 
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420 Measurement Certificates
To comply with 420 Class Rules, you need a Measurement Certificate in the owner’s name. These are issued by Australian Sailing.
See further information and the online form here https://www.sailingresources.org.au/class-assoc/measurement-certificates/
The new International 420 Class Association Exercise e-Book provides a selection of carefully chosen performance training exercises, with accompanying video and commentary to provide sailors and coaches with a step by step path to improving their skills. From covering boat set-up to techniques at mark roundings, strategies and tactics on the startline to gybing in strong winds, the e-Book covers a diverse range of training exercises. The International 420 Class Association Exercise e-Book is provided free of charge to 420 sailors and coaches around the world. Take a look at the 420 e-Book, at: issuu.com/420exercisebook/docs/420exercisebook
To comply with 420 Class Rules, you need a Measurement Certificate in the owner’s name. These are issued by Australian Sailing.
See further information and the online form here https://www.sailingresources.org.au/class-assoc/measurement-certificates/
The new International 420 Class Association Exercise e-Book provides a selection of carefully chosen performance training exercises, with accompanying video and commentary to provide sailors and coaches with a step by step path to improving their skills. From covering boat set-up to techniques at mark roundings, strategies and tactics on the startline to gybing in strong winds, the e-Book covers a diverse range of training exercises. The International 420 Class Association Exercise e-Book is provided free of charge to 420 sailors and coaches around the world. Take a look at the 420 e-Book, at: issuu.com/420exercisebook/docs/420exercisebook