Pass to pass it was from dead on to 5ft off every 20ft across the field. I'd like to find a used Raven Invicta115 or a Phoenix200 but for now I was hoping to get by with this one for mapping. I've seen an EZguide Plus with 1 hz otput do better at guidence on a Viper than this one is doing right now which makes me think its not really getting WAAs at all.