| Business | Phone |
| Cornerstone Measurement Sltns 1050 N Post Oak Rd 130, Houston 77055 | (713) 683-7066 |
| Geosynergy 16225 Park Ten Pl, Houston 77084 | (281) 579-3800 |
| Global Positioning Solutions 4422 Fm 1960 Rd W # 220, Houston 77068 | (713) 828-5256 |
| Gps Integrated Systems Inc 1414 W Sam Houston Pkwy N 110, Houston 77043 | (713) 973-8889 |
| Houston Survey Supplies Inc 600 Kenrick Dr # E16, Houston 77060 | (713) 856-8991 |