Crop Spraying
G'Day Static,
I use the Trimble AgGPS EZ Guide Plus. It consists of a lightbar and a screen that shows your runs. I have a iPAQ handheld computer next to it and my spray runs are shown as thick blue lines on it. All you need to do is fly the boundaries of the paddock, then fill them in. After flying the boundary it tells you the size of the paddock, so you know how much chemical and water to use. This is a good feature as I have rarely spoken to a farmer who didn't tell you his paddock was at smaller than it really is.
The unit is primarily designed for tractors but is great for use in a helicopter, especially an R22 where weight is such an issue. I reckon my whole system (antenna, lightbar and iPAQ) weigh a total of about 2.5 kgs and is powered from a cigarette lighter plug, so no expensive EO's. I did try a SATLOC but I could barely lift the light-bar so I sent it back.
And the price? About 5 grand Australian.
Watch out for wires and happy spraying.
Shorthorn