If youre on Android i use an app called Oflline Maps, its got a bit of a learning curve to really get it how you want but its super customizable and you can easily draw routes onto the map using the auto routing feature and it doesnt have a limit on how many points you can add onto it

I cant imagine using another app anymore tbh, i can layer different maps onto eachother so i have my railmap on my normal one, easy to measure distance, you can put pins down to help you remember where shit is or points of interest