. 2016 Oct 19;11(10):e0163785. doi: 10.1371/journal.pone.0163785
© 2016 Barhorst-Cates et al
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Fig 1. Example walking path with 3 landmarks.
