The Pacific Crest Trail Association's Section L map, which covers the 134 miles of the trail from Tehachapi Pass to Walker Pass in the southern Sierra, is in its eleventh edition. The cartographer for the eleventh edition is a retired land surveyor named Doreen Fairweather, who lives in Tehachapi, California, and has not been paid for the work.
Fairweather, who is seventy-one, took over the section in 2019 from a previous volunteer who had held the post for twelve years. She has, since then, walked every mile of Section L at least twice. She has updated the map in four substantive ways: she has corrected the location of two seasonal water sources, she has added three new rerouted segments installed by trail crews, she has revised the marked locations of two campsites that were moved due to fire-recovery work, and she has redrawn the contour interval in a small area where the previous edition's lines were misaligned with the underlying terrain.
Across the United States, this is how most of the maps that hikers actually carry get made. They are produced by trail associations, mostly by volunteers, using a mixture of public domain data and private knowledge accumulated through hundreds of hours on the ground. The associations sell the maps to fund the work. The cartographers, with rare exceptions, are not paid.
The Appalachian Trail Conservancy maintains an editorial relationship with eleven map sets covering the 2,197 miles of the Appalachian Trail. Each set is the responsibility of a member trail club, which assigns a volunteer cartographer or a small team. The maps are reissued every three to seven years, depending on how much has changed and how much money the club has.
The Continental Divide Trail Coalition, by contrast, took the decision in 2017 to produce a single unified set of maps for the 3,100-mile trail. The work is done by a small in-house team, which includes one paid GIS technician and a rotating cast of volunteers. The unified set is now in its third revision and is widely considered the best long-trail mapping project in the country, although it still lags the AT in field-checked accuracy in some sections.
Smaller trail systems are mapped less consistently. The North Country Trail, which runs 4,800 miles from North Dakota to Vermont, relies on a quilt of state and local maps produced by chapter volunteers, with quality ranging from professional to handmade. The Ice Age Trail in Wisconsin maintains a unified set, produced by a small staff cartographer at the Ice Age Trail Alliance. The Florida Trail has produced a complete set of section maps in only two of its three official versions since 1990.
What unites the volunteer trail cartographers, in conversation, is a particular kind of patience. The work requires technical skill, but the technical skill is not the obstacle. The obstacle is the slow accumulation of accurate field data, the negotiation of disagreements about which path to mark as primary when a trail has a heavily used alternate, and the editorial decisions about what to include and what to leave off.
Fairweather described an example. On Section L of the PCT, between mile 615 and mile 622, there is a heavily used water source called Robin Bird Spring. The spring sits about a quarter mile off the trail. Some hikers reach it by an unofficial path that descends a steep gully. Others take a longer, gentler route along a closed jeep track.
The previous edition of the Section L map marked only the unofficial path. Fairweather, after walking both routes herself in 2021 and 2023, decided to mark the jeep track route as the primary access and the unofficial path as a secondary route. The decision was not uncontroversial. Two longtime trail volunteers wrote to her in disagreement, arguing that the unofficial path was the established route and that changing the map would confuse hikers who had used the previous edition.
Fairweather considered their arguments. She walked both routes again in 2024 with a stopwatch. She concluded that the jeep track route was faster, easier on the knees, and more sustainable in terms of trail erosion. The new edition shows the jeep track as primary. The two volunteers who objected accepted the decision, though one of them, she said, still grumbles about it at the section's annual meeting.
This kind of decision, repeated thousands of times across thousands of small choices, is what shapes a trail map. The volunteer cartographer is not a neutral recorder of fact. The cartographer is making, in each line and label, a judgement about how the trail should be walked. The judgements are usually invisible to the user. They are the substance of the work.
The financial side of the work is small and precarious. The PCTA's Section L map sells for $9.95 in print and is also available as a free download. The Appalachian Trail Conservancy's map sets sell for between $14 and $18 per set. The Continental Divide Trail Coalition does not charge for its maps, which are funded by donations and grants.
None of these revenues cover the actual cost of production if labour is counted at a market rate. The Section L map, Fairweather estimated, represents perhaps three hundred hours of her time on the eleventh edition alone, not counting the field walks. At a modest professional rate the labour cost would be eighteen thousand dollars. The map's annual print revenue is, in a good year, about four thousand dollars.
What sustains the work is the same thing that sustains most volunteer infrastructure: the volunteers themselves. Fairweather walks the trail because she likes the trail. She makes the maps because she likes maps, and because she has the skills, and because no one else in Tehachapi has both. When she eventually steps down, the PCTA will look for someone to replace her. The replacement, if past pattern holds, will be a retired engineer, surveyor, teacher, or cartographer who has time and aptitude.
There are concerns about succession. The PCTA's current section cartographer pool has an average age of sixty-six. The youngest section cartographer is forty-two; the oldest is seventy-nine. The pipeline of younger volunteers with cartography skills is thin. The skills themselves — using GIS software, reading topography, walking with intent — are not particularly hard to learn, but the combination of skills and the willingness to spend hundreds of unpaid hours over years is increasingly rare.
Some trail organisations have begun to experiment with paying part-time cartographers. The Continental Divide Trail Coalition's model, with a paid GIS technician anchoring the work and volunteers contributing field knowledge, is being studied as a possible template. The Appalachian Trail Conservancy considered, in 2024, hiring a part-time staff cartographer to coordinate the work of the member clubs, but the budget was not approved.
The volunteers do not, in general, want to be paid. Most of them, asked, said that payment would change the nature of the work, would make it feel obligatory, and would risk replacing the slow, attentive amateur tradition with something more transactional. Fairweather said this herself. She would not take payment for the Section L work even if it were offered.
What she would like, she said, is for hikers to send in corrections. The map carries an email address. In a typical year she receives perhaps thirty messages, most of them substantive. She acknowledges every one. She incorporates the ones that hold up under verification. The eleventh edition includes, by her count, fourteen corrections that originated with hikers who took the trouble to write.
The twelfth edition is scheduled for 2028. Fairweather expects to be the cartographer. She expects to walk Section L at least three more times before then. She has, she said, no reason to stop.
