Google Maps & Android Navigation

Hi, I have managed to upload a GPX map to My Maps on Google, but in Google Maps I can only see it as an overlay and any navigation asks for new start and termination points. Can anyone help and let me know how I can use the self created maps in Google Maps for navigation. If not are there other recommended apps out there on Android which will offer such without a charge? Thanks
Rose Pro DX Cross 3000
GT Edge Ti
Ribble Audax
GT Edge Ti
Ribble Audax
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I have found that OS Maps is also good for bike navigation, it shows you routes others recommend in the area, which is great if you go on holiday somewhere new and want to check out where the good rides are.
I still like sellotaping a route card to my stem though