This app was mentioned in 4 comments, with an average of 1.25 upvotes
SkyDroid - available on both Android and iOS. Best $1 decision I’ve ever made. Has every course that I’ve used it on. Has a course mapper tool online that you can add markers wherever you want on the course.
I use SkyDroid as a phone GPS and it's really accurate according to my rangefinder, as well as course markings.
https://play.google.com/store/apps/details?id=com.goldsteintech.android
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