This volume is the tenth in a series of 29 coordinated MINNEMAST units in mathematics and science for kindergarten and the primary grades. Intended for use by first-grade teachers, this unit guide provides a summary and overview of the unit, a list of materials needed, and descriptions of two groups of activities. The purposes and procedures for each activity are discussed. Examples of questions and discussion topics are given, and in several cases ditto masters, stories for reading aloud, and other instructional materials are included in the book. This volume introduces the basic geometric notion of linearity, and provides activities related to the use of properties of lines in determining positions of objects. Lessons are organized into two sections: (1) lines, direction and location, and (2) locations and maps. A master for a "take-home fun activity" related to location of places on a map is also included. (SD)