I’ve been using BikeGPX to help me fill in holes in my Ride San Fernando Valley project. It’s free, and it works well – unless I make a crazy route that keeps doubling back on itself. The it gets confused and I have to nudge it back on track. But for any normal cyclist trying to ride pre-planned routes, it’s a pretty cool thing. Worth having!
The other “use a map to plan a route ahead of time” issue: Did you know that roads and maps sometimes don’t line up? It’s true! It’s almost like the city is constantly changing or something.

2. I was supposed to ride in here, but all the crisscrossing confused the map app.
But even with glitches, the southeast valley is starting to fill up.

Heck, in a couple of years I might actually finish this thing!