The map is fine. It's waterproof and includes the majority of the popular (and not so popular) hiking trails of SEKI.
But this map isn't particularly useful once you're on the trail. Here's why:
1. Despite how well-marked the High Sierra Trail is on this map, almost none of the backcountry campsites are plotted. I only have experience with the HST, but I imagine this is true of other trails as well. It would be incredibly helpful for both planning and hiking if the campsites were on the map along with the distances between them.
2. Again, despite how well-marked the HST is on the map, the distance markers aren't particularly "useful." It's difficult, using the map alone, to determine distances between campsites and other relevant spots along the trail. To be fair, major distances, like those between trail intersections, are plotted and somewhat useful, but the scale isn't fine enough to determine other distances.
3. The distances which are plotted differ (sometimes not inconsequentially) from the National Park Service trail markers. And those, in turn, differ from what my GPS measures.
While the map is useful, there are other free resources which are equally or more useful for planning a backcountry trip than this particular Tom Harrison map. Google is your friend.
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