Hi Ian,
for people that want to join in but don't have a gps we have a handheld radar gun. we take it to the event specifically to encourage participation and understand that not everyone has all of the kit. by entering the event you also go into the draw for the major prizes as well as stand a chance to win the radar class.
i'd definately encourage everyone to enter the event, it's also important for the longevity of the event. the other option if you come down and decide you don't want to compete is you could join in the action by joining the organising group. we are always looking for volunteers.

the course itself takes up the majority of the speed run, depending on wind direction ie, 3-4 km. so it is hard to sail in the flat water areas without entering the course. another potential issue is that freesailors don't usually attend the briefing and therefore aren't aware of the setup of the course or the instructions for the day regarding right of way and safety controls which can become dangerous out on the water.
last year we had a non competitor on the course. they came because the event was there but didn't sign on, then sailed the course unaware of the setup. although innocent it ended causing issues and resulted in myself being sent threats and slandered for months afterwards. contact was also made with a sponsor and MSQ to put a slur on the event.
because of that experience, this year we will be asking non competitors to leave the course area during competition. it's a shame and it's not the type of thing i really like doing but i unfortunately have no other choice.
now with all of that said, the course is set at low tide. so we usually sail from 12 noon till 6pm. all other times we will all be out freesailing and most of us are there for the week so there willl be plenty of opportunity.