I'm a bit discouraged. I didn't think the route generator looked great, on the clip I found, and I found Cranston's masking tips a bit cryptic. I'm reluctant to install a new paint/photo program though I have access to Photoshop which I tried to use for this. I use Photoshop a lot at work, but I actually know very little about layers and masks, and I assume layers (not mentioned in the clip) are required, and is "transparent" the same as putting the opacity to zero?
The other issue with this method (I think) is that I'll be starting off each daily chapter of my video with a zoom into the map, and then the route animated, and I'm using pretty big old files so that it can zoom in and look good. If I could get this mask thing to work I assume I'd be using different versions of the same map for each day.
At the moment my previous method of zooming into the map and fading in asterisks from the titling software is quite attractive. The mask method looks a bit more professional, but also quite a lot more involved.