Greg Dunlap wrote:

Actually, one has a lot more control that you can imagine. First of all,
the kites are 150 feet away from you and thus about 60 + feet up in the air
above the water. If you keep the handles level, the kites will pull
straight forward. If you pull left they turn left and so on. The distance
you pull determines the amount of variance from center that they will head
for. One actually has about 65 degrees from center to play in or an arch of
approximately 130 degrees to play with. Of course the more you cause the
kites to travel away from center, the less pull is generated because they
are spilling the wind force to maintain that heading.

Yes, I've tried it with a single kite but had some problems when the wind
changed frequently. Carquinez Strait often has a pretty steady west wind,
but in other places the wind would die down and I found myself catching up
to the kite as it then fell into the water.
Don't think I want to try that with my kayak. The Carquinez Strait was
where I first tried out my beach umbrella for downwind 'sailing' - not

as

much power as a parafoil but easier to deploy and control.
http://206.40.48.186/uploads/UMBRELLA2.JPG