for a new route, or if I'm running somewhere unfamiliar (e.g., getting
a run in while on a trip), then I just go by time. I also have found
park trails with mileage marked off. (granted these are paved trails,
not dirt paths, so little difference from road running except the
scenery)
I have checked out mileage using a car, but I never have used a map or
GPS for my routes. I have checked the mapped route of a race using the
car also.
Part of the fun of running without a map is the adventure of not kowing
what is ahead. Doing that, even in big city runs, I have seen deer, and
other animals, rivers and streams, and beautiful sunsets and scary
storms.
I record my runs and really just track mileage. IOW, I track the miles
Year-To-Date, but not other totals. It's all on paper, though I keep
thinking I should put it in a spreadsheet to make nice charts and
graphs. But I'm happy now, just running along.
Enjoy,
Ed