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Re:Show HN: GPX replay map that shows terrain shadows during... by tppiotrowski on Wednesday October 13, 2021 @01:51PM (#28855248)
Good suggestion. I need to improve the UX. And you are correct, the grey overlay is night time.
Re:Show HN: GPX replay map that shows terrain shadows during... by alanbernstein on Wednesday October 13, 2021 @02:14PM (#28855495)
Really neat project.

Relevant to the parent suggestion, you might add some indicators on the slider to show where daytime is.