I had a fin session at the same place where i supposedly hit 36 knots on foil. Even gps speed surfing said i hit a 36knot 2sec that day
Anyway on fin my watch said i hit a 63knot 2 sec. I didn't have the balls to submit to gps site to see if it would of approved the 2sec
There are high tension power lines right in the area where i hit that speed. Maybe throws off the gps
Not according to the following paper I found in a Google search. Although the testing was done on static a GPS. It may be different for a moving GPS.
www.tandfonline.com/doi/abs/10.1179/sre.2001.36.279.54
I doubt high tension power lines would have any effect under normal conditions. But I guess a high energy arc over would create a very broadband transmission over the electromagnetic spectrum. This could certainly corrupt the satellites signals. But decent filters should remove such spikes. What analysis program are you using?
I put it in GPSresults V6 and it said I had a 2sec of 34.7 knots. Pretty certain I did not go that fast.
Not sure what gps-speedsurfing does but they said it was a 63knot 2sec. I did not leave it there for very long so maybe it would have been reviewed by their software.
very dodgy looking data, I wouldn't trust it to be within a couple of knots. Those holes in the speed graph are where the data falls outside GPSResults's filters.
Ahhh I see it's a coros, that sort of explains it.
GPSS>3 isn't going to say it's bad data, as they have a financial interest in that watch.
Just a thought, power lines near salt water, will probably get a buildup of salt and dust on the insulators. Combine that with any moisture and you'll get an ark over. This could definitely affect the gps signal. In some places they use helicopters to clean the insulators with a water spray, before that starts happening.
Been using gps on bikes for years and noticed there's some areas where the signal always gets messed up, I can guarantee that one certain sections of road it will loose signal or show some stupid high speed, never worked out why.
Nice thing about GPS on water is that you generally have the absolute best conditions for grabbing satellites. "Clear view of the sky." No canyons or trees or buildings to block the signals. Now, power lines over water could be an issue. I have never noticed it.
People talk about having the GPS watch on the underside of the arm, or signal blockage by boom or sail or mast. I have never noticed that, either. But then I use GPS only for recreation and archiving. I don't need the absolute ultimate in accuracy or HDOP.
I'm fairly sure 50hz or 60hz radiation from power lines will have no effect on GPS reception.
However a small arc over on dirty moist insulators probably will.