I am a heavy user of offline Google Maps when I'm travelling. Is there was way I can tell Google Maps to constantly monitor where I am and create a line on a map to show all my movements?
I'm pretty sure that Google Maps is always collecting this data anyway for its own purposes, so I don't think there is a privacy consideration here.
If this isn't possible with Google Maps, is there any 3rd party app that could do this? If so I would still want the map created in Google Maps format so that I could open it in My Maps.