So, because I’m OCD, I discovered an app called OsmAnd. You can create custom routes, save them, and launch your ‘track’ to get audio turn by turn navigation. That way I can use my phone to give me turn by turn using earbuds. I could not figure out a way to build custom maps with audio turn by turn features in Google Maps or in Google My Maps.
It saves them as a GPX file so can share. My ‘track’ is called To Hell and back.
I plan to test this over the weekend.