[GPSNavX]

To follow up, XTE (Cross Track Error) is plotted on the chart. When a waypoint is activated a red line from origination position is drawn to the waypoint as is a blue line from current position drawn. As XTE increases the red and blue lines separate. In addition an arrow indicating direction to turn to reduce XTE is drawn in the compass band.

XTE is shown multiple ways in this screenshot ..

http://www.inavx.com/images/screenshots/...nchart.png