After much testing I found the following to work:

Using linking or copying, get the PC created route to a mobile device (e.g. via text).

When you open it, you will see what the OP describes: the route with a Preview but no "Start" driving feature.

Now, in order to get a "Start" button and commence navigation:

  • Click on the vertical ellipsis in Maps with your route displayed,
  • click on Edit Stops,
  • click on Add Stop,
  • select "Your Location",
  • move your location new stop to the top,
  • and press "Done"

The Start button should now appear and you can navigate.

It is not what one would call obvious.

Answer from Paul Sears on Stack Exchange
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Lifewire
lifewire.com › make-custom-route-on-google-maps-4126536
Use Google My Maps to Send a Custom Route to Your Phone
September 9, 2021 - To use Google Maps' turn-by-turn navigation, tap the second destination point (skipping the first one assuming that you're starting there) and then select Directions to start your route. Here's where you might notice Google Maps navigation takes you off your route, and therefore you should add additional destination points where there are no planned stops.
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Google Support
support.google.com › maps › thread › 14063603 › how-to-use-maps-created-in-google-my-maps-that-can-be-navigated-using-google-maps
How to use maps created in Google My Maps that can be navigated using Google Maps? - Google Maps Community
September 10, 2019 - Google Maps Help · Sign in · Google Help · Help Center · Community · Google Maps · Privacy Policy · Terms of Service · Submit feedback · Send feedback on... This help content & information · General Help Center experience · Next · Help Center · Community · Google Maps ·
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mymaps.google.com
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Sign in · Use your Google Account · Not your computer? Use Guest mode to sign in privately. Learn more about using Guest mode · Create account
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My Maps – About – Google Maps
Discover the world with Google Maps. Experience Street View, 3D Mapping, turn-by-turn directions, indoor maps and more across your devices.
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Reddit
reddit.com › r/googlemaps › using navigation in google maps using a map from 'my maps'
r/GoogleMaps on Reddit: Using navigation in Google Maps using a map from 'My Maps'
May 17, 2022 -

Hi, I've set up a custom route from one destination to another using "My Maps" the route is a cylcing commute route I've drawn out using some off road areas.

I've worked out how to access maps I've created from My Maps on Google maps but I can't get it to use the route when I want to navigate on that chosen route.

Can anyone assist? I've tried googling and YouTube and can't find anything on this.

Is there an easier option without using My Maps? Perhaps editing a route and saving it on Google maps for future use?

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Google
google.com › earth › outreach › learn › visualize-your-data-on-a-custom-map-using-google-my-maps
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Click the hand icon to stop drawing. You can also save driving, bicycling or walking directions to the map. Use the ruler icon to measure distances and areas. To access and edit My Maps on the go, you can view and edit maps on your mobile browser; or just view them in Google Maps for mobile.
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Android Police
androidpolice.com › home › applications › google maps isn't my navigator anymore, but i still can't remove it
Google Maps isn't my navigator anymore, but I still can't remove it
2 days ago - If something unexpected slows my commute and every minute counts, Waze is my first choice. The constant flow of community reports makes real-time rerouting incredibly effective. It’s visually busy, but speed wins in those moments. When I want clean, easy-to-follow navigation, particularly in outdoor areas with limited signal, Sygic is the better alternative. The irony is that Google Maps remains impossible for me to delete.
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developers.google.com › google maps platform › android › maps sdk for android › show my location
Show My Location | Maps SDK for Android | Google for Developers
It showcases the use of the "My Location" button to display the device's current position with a blue dot. The sample code requires setting up your development environment and obtaining necessary location permissions.
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Roaming the Americas
roamingtheamericas.com › home › blog › how to use google my maps to plan a trip (ultimate guide)
How to Use Google My Maps to Plan a Trip (Ultimate Guide) - Roaming the Americas
January 1, 2024 - Google My Maps lets you create shareable custom maps with multiple layers, plus location pins with icons and notes. It’s a great way to brainstorm travel plans or create a trip itinerary from a desktop. And since the map can be viewed in the Google Maps app, you can use it to navigate on the go.
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mapstyle.withgoogle.com
Styling Wizard: Google Maps APIs
Support for 250+ advanced customizations Optimize your map with POI filtering, POI density control, zoom-level customization, and more to help make your map more engaging and increase conversions.
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Google
earth.google.com › web
Google Earth
Aw snap! Google Earth isn't supported on your device. Please try Google Earth on a supported device or your desktop browser
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Google Support
support.google.com › maps › answer › 3045850
View your My Maps using Google Maps - Android - Google Maps Help
If you've created a My Map, you can view it in the Google Maps app on your phone or tablet. Sign in and open the Google Maps app . Tap You Maps. Learn how to navigate to places on your custom maps.
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Routific
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Directionally Challenged Traveler
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YouTube
youtube.com › melissa hero
Driving Directions Using Google My Maps - YouTube
How to create your own custom maps using Google My Maps, share them with others, and use the map on a mobile device to get directions to each point on the ma...
Published   December 20, 2015
Views   27K