So yesterday I had a run up to St Marys Loch near Selkirk and tried my iPhone as the sat nav on the way back and I couldn't hear a thing the volume on the app turned to max so I tried Google maps again couldn't hear a thing so I'm gonna knock that idea on the head, if I turned the volume up on my scala rider G9x it would have blown the headphones when the music came back on so gonna look at a cheap sat nav.
gutted.
Thanks for all your replies.
gutted.
Thanks for all your replies.