Riffing of the predictability of an adjustable distance, a similar option might be something like a marker/inverse colour applied to a line immediately before t

Riffing of the predictability of an adjustable distance, a similar option might be something like a marker/inverse colour applied to a line immediately before the scroll. The marker would help orientation after the scroll and disappear after some time. You could also scan the text of course but a marker would be much faster.