Navagation app that will let me add custom points on a per-route basis

Hi
I'm wondering if there is a navagation app that will let me add custom points on a per-route basis, and alert me when I walk said route? It would for instance be useful if I had some notes on a particular route, like a certain landmark I can use for orientation purposes.
The reason I want it on a per route basis is that I don't want points of interest for a certain route to cludder up all the rest of my navigational endeavors.
Best
Malthe

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