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AUS1111 said..sailquik said.. I used my GT-31's for downhill skiing for a couple of years before my iPhone took over.
How fast did you go? I hit 84.7kmh on a snowboard and 87.8kmh on skis, but I've seen people on skis go past me like I am standing still.
My seven year old did 70kmh on skis, but that was mainly because he hadn't really learned how to turn yet and the slope got unexpectedly steepish. I couldn't catch him. The poor little bloke was terrified! Thankfully there was a long flat run out at the end and he eventually skidded to a halt.
Another question for you Andrew, since you're the tech guru; would the speed calculated by GT31 or the iPhone take into account the slope, or is it just the lateral speed?
Downhill ski's: peak speed just over 100kmh one morning!
Got to the top of Black Snake at 7.30am one morning and it was perfectly groomed and empty.

I had my GT-31 on and could not resist it. I straight lined it in a tuck. All was going well until about 2/3rd of the way down Blue Snake I stood up and had to think about slowing down! That was the scary part as I struggled to keep my skis from chattering on the icy slope as I put the brakes on!

I can tell you though that 100k's is bloody fast! I recon my eyes were watering inside my goggles!! Maybe it wasn't the wind..... lol
I managed to stop before the end of the run thank goodness!
I rather think that was pretty accurate, as the speed graph was smooth and a normal looking curve, but I have seen a lot of pretty ridiculous speeds that were clearly errors on my iPhone. It has told me I went over 90-100kmh quite a few times when clearly I have not gone anywhere near it. Normal skiing speeds for me range from 20-50K kmh up to a max of about 75-80 kmh on the groomed runs or open powder slopes where I can really let it go.
My speeds on the snowboard and telemark ski's are much lower.
I remember doing a bit of research at the time (more than 5yrs ago) and I think I set the GPS speed to 3D, (stretching the memory now and I may be getting confused with the GT-11). I think we normally have 3D speed off in the GT-11/31 because it increases accuracy for known constant altitude as it always is on the water (within a meter or two anyhow

) I will have a look at some settings when I have a GPS handy.
I would assume that the iPhone Hotham App (by Resorts Tapped) has 3D speed turned on. There is no way to know what errors it has though as we can't get a speed graph out of that App. If you find a Phone ski App that has a speed graph (or can download the tracks to your computer) you can at least see if the speeds look realistic and spike free.