I am aware of the usual method to make marks on the anchor
chain or -rope to indicate the length let out. Various color codes have been suggested - however they all require someone going to the bow and check the marks.
Have also seen the e-winch counters with cables
led to the cockpit
to show readings.
However, what I was looking for is a way, to mount a sort of sensor or tag to the anchor
and then measure the distance by e.g sonar signal which then can be shown in some app on the Raspi or handphone.
Has anyone played around this ideas or any experiences/comments?