In the field I use a Garmin Oregon 400t and different cameras for photo mapping. I try to improve bicycle routing as well as hiking paths. And sometimes I also contribute to Humanitarian OpenStreetMap tasks.

The different profiles of my Oregon are currently set up to display different routable maps like these:

• Johannes Formann's cycle map
• OpenTopoMap
• RadReiseKarte
• Freizeitkarte

All of these osm based maps have some nice features that work well (or even great!) for walking and cycling as well as driving a car.

Continue reading in the osm wiki.