[Google Maps API v2] polyline width

I'm writing an app to help me keep track of where I have sprayed on the farm. I'm using the api v2 and the get??Location from the GPS to draw a polyline on the map.

I need to set the width of the polyline based upon the width of my sprayer boom. 

I understand that the width() method in the api sets the polyline to a pixel width. I also understand that the map system is mercator based and depending on what field I am in a conversion from feet to pixels will not work.

Any ideas on what to incorporate or apis already out there that allow me to make location specific feet to pixel conversions.

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