Sail Training and Analysis Device

I did think about filtering it and showing a nicer sample , but hey, it's all a learning process and I'd only be cheating myself (as my mum would say). The wind was great - fully powered gusting to slightly overpowered, with not much by way of waves (Chew is a lake after all!), so I think a decent profile would look a lot smoother than that.

You can do just about anything post-processing the data, moving point averages etc. The sample rate was very high (256Hz) and could be set to a less sensitive rate, but I wanted to be able to look at individual tacks and memory isn't a problem.    

That's alright if it's to facilitate steering!
Maybe a minute long turn to port... I see this as very honest - you could have changed the sample rate and the aliasing would have smoothed it out a treat!

Can't upload the picture for some reason...

very good Jimbo!

Do you know how far/fast you roll through a tack?
Do you know how far/fast you should roll through a tack?
Are the two the same?
How upright do you sail?
How upright should you sail? (as Dan H pointed out on SA, flat isn't always fastest if a bit of heel gains you extra righting moment).
How quickly do you respond to gusts/lulls heeling the boat?
How much do you pitch when punching in to waves? How much has practising a new technique improved this?
What leeway angle do you make when pinching a bit? Should you use a bigger board?
How smooth is your change of heading when you tack or gybe?
How far forward should you sit upwind in 7kts/12kts/18kts? Ears are great, but does Hamilton rely on his ears or on his electronics when driving at 150mph?
For that matter you could put one on the boom to meaure sheeting angle, kicker angle etc.