Raymarine LightHouse Sport Basic Operation Instructions page 60

Goto cursor / Goto waypoint Follow route
The rolling road graphic represents a width of water, equal to the limit
specified in the cross track error (XTE) alarm, on each side of your
vessel. The Cross track error alarm can be configured from the alarms
menu: Homescreen > Settings > Alarms > Cross-track error:.
During active navigation (performing a Goto or Follow) , navigational
data and steering advise are provided on the page.
Follow the steering advise to correct any course deviation that occurs
and maintain your course to the target destination.
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