Patterns. I love them. Patterns are great because once you figure it out, the comprehension of new samples is dramatically accelerated. A common pattern in data visualization is [small multiples](https://en.wikipedia.org/wiki/Small_multiple). In the case of trail maps, here are "teach once, use often" principles I implemented:
- Consistent layout
- Consistent imagery and iconography
- Consistent labeling
- Consistent scale (when appropriate)
- Visual patterns (title in the upper left, difficulty rating icon,
- Consistent context (Section thumbnail, compass
