A character with this skill can hide in rural environments almost perfectly, using trees, branches, and undergrowth for cover. Hide tests should be made with a +20% modifier if the character is keeping still or a +5% modifier if the character is moving cautiously. Rural environments are basically all non-urban areas: farms, woodlands, river banks, fields, parks and gardens, jungles, swamps, and so on. The distinction between rural and urban can blur in some circumstances: for example, formal gardens attached to a town house. In such cases, the gamesmaster should decide the environment involved.
Obviously, there needs to be somewhere for the character to hide. The gamesmaster should ask the players to describe what their characters are doing to hide and modify the chances accordingly.