If you want to use one of the online mapping sites ( Google maps, yahoo maps, ..) you can use Northshore Dr., Tullahoma, TN as the address to find.
From Nashville or Chattanooga:
From I-24 take exit 117 (Arnold Air Force Base/ AEDC/ University of Tennessee Space Institute) turn south (left if coming from Chattanooga, right if coming from Nashville) onto the AEDC access road. Following signs for the Gossick Leadership Center, stay on this road (you will not see much except for trees and gates going onto the Air Force Base) for 4.8 miles. Turn left just beyond the 2nd base entrance and drive 2.9 miles to Northshore Rd. Turn right onto Northshore Rd and continue 1.4 miles to the Gossick Leadership Center and main Recreation Area.
Coming from Huntsville on State road 55 from Fayetteville: Follow 55 to Tullahoma. 55 will bring you into Tullahoma on Wilson Ave., which dead ends at Jackson Street; turn right. At the fourth traffic light after you turn right onto Jackson St., turn left onto Carroll St. Go to the next traffic light; turn right at Anderson St. toward Arnold Center. You will travel about 6.5 miles to the University of Tennessee Space Institute (UTSI) road (road is not marked but signs are posted directing you to UTSI). Turn right onto UTSI road and travel approximately 2.4 miles to a 4 way stop and turn left onto Northshore Rd. Travel approximately 0.5 miles to the Gossick Leadership Center.