| Business | Phone |
| Refraction Technology 2626 Lombardy Ln # 105, Dallas 75220 | (214) 353-0609 |
| Microtrak Gps 9101 Lbj Fwy 100, Dallas 75243 | (214) 361-8812 |
| Resqstar Systems 14785 Preston Rd 550, Dallas 75254 | (972) 789-5555 |
| Summary Systems 1120 Empire Central Pl, Dallas 75247 | (214) 638-3282 |
| Lone Star Gps 2925 University Blvd, Dallas 75205 | (214) 368-3452 |
| Navpro Navigational Products 6839 Carolyncrest Dr, Dallas 75214 | (214) 827-4845 |