Blackbox 510 gives auto shutoff for spreaders

Patchwork Blackbox 510 GPS guidance unit has a bigger and brighter screen than its prdecessor and can cope with hills and side slopes.
Basic cost is £1350 and a variable-rate facility can be added for another £400. Auto shut-off for spreaders can also be used and the Web Track facility stores field data overlaid on Google maps and links with mapping software packages.
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