"Try not to upset the landowners, leave a mess, or do anything that might cause them to post their land," Garrison wrote.
Only one area of trails, those around Larcom Mountain, has not appeared on previous maps, he said. When he stumbled upon the trails off Mountain Road in South Tamworth, they were well-worn, clearly marked with yellow arrows and unposted, he said.
The trails have since been posted.
"There seems to be a sentiment that locals are welcome up here and outsiders should go away," Garrison said.
The peaks of Larcom and Little Larcom Mountain are owned by the Lakes Region Conservation Trust. Much of the surrounding land is owned by the Bemis family.
Kate Thompson, a cousin of the Bemises, lives on Mountain Road.
"There's a hope that responsible local hikers will understand that they are still welcome," she said.
Asked about Garrison's feeling that outsiders aren't welcome, Thompson said it depends on whether people treat the private land with respect. She said the region's long tradition of welcoming people to use the land has been abused.