Here's a more specific guideline from the D2 manual:
18.104.22.168 Local Sports Clubs. In sports other than basketball, an institution’s coach may be involved as a participant or in instructional or coaching activities in the same sport for a local sports club or organization located in the institution’s home community, provided all prospective student-athletes participating in said activities are legal residents of the area (within a 100-mile radius of the institution). Further, in club teams involving multiple teams or multiple sports, the 100-mile radius is applicable only to the team with which the institution’s coach is involved; however, it is not permissible for the coach to assign a prospective student-athlete who lives outside the 100-mile area to another coach of the club. A coach may be involved with a local sports club located in the institution’s home community that includes prospective student-athletes participating in a sport other than the coach’s sport, regardless of where such prospective student-athletes reside. A coach also may be involved in activities with individuals who are not of prospective student-athlete age (i.e., before the ninth grade), regardless of where such individuals reside.
The D1 manual has a similar rule, but more detailed and with a 50 mile radius.