What is ‘auto-steer ready’? While designed primarily to allow buyers to install the tractor firm’s own system at purchase or at some time in the future, this spec also makes it relatively simple to mount other retrofit kits. Here we try out three such systems IA trio of ‘auto-steer ready’ Fendt 820 Vario tractors, all operated by the same farm, provided us with a unique opportunity for this comparison, which we carried out in mainland Europe last autumn. A quick call to three different suppliers of retrofit kits transformed our initial test concept from basic idea into in-field reality. We approached three manufacturers that provide ‘plug ‘n play’ systems for mounting onto tractors equipped with the necessary steering components: Reichhardt Topcon Trimble