Can you alter the colour and size of the directional arrow to make it bigger and brighter?
The size of the position marker is fixed but the colour can be changed by creating a custom map theme. There is a fairly lengthy thread about it in the 530 forum.
https://forums.garmin.com/sports-fitness/cycling/f/edge-530/290989/how-to-make-course-line-easier-to-see/1622640#1622640
