In this context it no longer takes a few seconds; they would need to have access to a computer which is only possible onshore. If anyone protests then it is very easy to prove they are in race mode as the only function of the device is showing the heading information.
This also conforms to rule C.5.2:
In addition to the optional equipment referred to in C.5.1, where
stipulated in the SI and where supplied by the Organising Authority, one
or more devices may be used which have the capability to measure,
display, record and broadcast information relating to the boat’s position,
heading, header and lift information, VMG, time, and/or speed. Such
devices will not provide any information or data to the crew during a
race.
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The reason I'm contesting this is a valid device when in race mode; is for those that are isolated at clubs with less Areos. This then can be used as a tool to practice, and still remain race legal and fair towards the philosophy of the class.
This means I don't need to purchase additional devices in order to log my course an analyse my races, and I can use the speedpuck when not racing to learn the dynamics of the boats.