Last week I was on the lake and twice I monitored it intently. I parked by trees for reference and the Xi5 kept me within 2-3' for 10+ minutes both times. In playing with it, I marked a waypoint by another stump then fished away from it. When I told it to go back to that waypoint (probably 30 yds away), it got within 5'. Don't know if the Xi5's shipped with different software or not. I ordered mine early March.