Player Wilderness Mapping a la 'West Marches'

One of my players is planning to GM a West Marches type campaign soon, and I'm also thinking about doing a Wilderlands sandbox. In my games I tend to just hand my players the wilderness map, while keeping my dungeon maps secret (for Underdark I often just use a nodal or linear travel map). But the West Marches approach of no GM-provided map, players doing their own mapping and maintaining a shared wilderness map is interesting, and seems to make exploration potentially a lot more exciting. Anyone have experience with doing this?

Player Wilderness Mapping a la 'West Marches'