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Dufur, OR | I sat down last year and played with numbers to figure out what it the FMX was looking for. For liquids it appears to be liters/hectare and weights lb/hectare. Why trimble can't just put that in the little help menu I don't know because the conversion numbers are ones you never see and really made at least me go ?????. But for NH3 it is just wierd and I believe wrong on the factors. Our dealer sent a note last year to use 1.363 if your maps are in lbN and operating in lbN on the display (which is what I do). The screen would indicate to use 1.121. I never asked what would be right for lbNH3. I can only imagine trimble has received thousands of requests for VRA on the FMX to be 1:1 with whatever units you are working in. Then if you want to up by 10% you just use 1.1 like every other screen there is as far as I know. Or if you have lbN and want lbNH3 1/.82 etc.
A side note on using VRA - I write my own maps and sometimes while in the field I decide I messed up and want to up or lower the rate a bit for that area. Although the manual says it won't let you change the rate while running a variable map it will - just hit the + or -. But then what you have done is offset the whole map by whatever your increment is set at and there is nothing that tells you how far offset you are. I first started VRA with an ez500 and ezboom and it worked the same way. So I write my maps with even number rates like 50 or 55 and I set my increment at x.9 like 9.9 or 4.9. That way you can remember if you have offset the map just by looking at the target rate. This turned out to be double useful for the FMX so that I could verify that I had the right conversion factor as well.
Mathew
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Trimble fm-1000 variable rate nh3 question
