Have a My Map you'd like to share? No problem!
Once you are logged in to your account via the app, click on "Favorites". From here, click on the "My Maps" tab on the right hand side. When your saved maps are visible, swipe to the left on the name of the map you'd like to share which will display a "share" icon.
When you press the "share" icon, you'll see a new page which has your options for sharing - via text, email, copy and paste, or you can save to the note pad on your phone.
And just like that, you can share any of the maps you want, with whomever you want!