We share maps of our trips using CalTopo.com. We also use it extensively to prepare data prior to a trip as it has a full set of tools to create, edit, join, split, and simplify tracks and routes. CalTopo also has many power-user features such as fire history, snow sensor overlays and an excellent map-printing tool.
Viewing CalTopo maps works on a smartphone but it is much easier to use all of the functionality if you use a large screen, so we recommend using a desktop computer or laptop.
Here are the most critical things you need to know to successfully view our maps and copy our data. The numbered list refers to the numbers in the image.