| Business | Phone |
| Kongsberg Maritime Inc 7225 Langtry St 700, Houston 77040 | (713) 934-8885 |
| Gsi Marine 7322 Southwest Fwy, Houston 77074 | (713) 981-3817 |
| D & G Communications 333 Clay St, Houston 77002 | (832) 366-1536 |
| Geonav Limited 11211 Katy Fwy 430, Houston 77079 | (713) 722-9697 |
| Mercator Inc 11211 Katy Fwy 430, Houston 77079 | (713) 464-4353 |
| Marine Precision Technologies 5910 South Loop E, Houston 77033 | (713) 644-3823 |
| Mackay Marine 8532 South Loop E, Houston 77017 | (713) 644-9246 |
| Houston Electro-Tech Inc 7999 Hansen Rd # 315, Houston 77061 | (713) 944-1213 |