"Unless a boat sailed under the power lines there won't be interference."

He said the trial was able to "notch out" certain frequencies used by emergency services. This allowed TasTel to avoid transmitting over certain frequencies.

Peroni said the only independent voice in the trial was the regulator, Australian Communications and Media Authority (ACMA), who are monitoring the trial closely.

"A handful of operators will continue to be against the product. But the important thing is we all have an open relationship with the ACMA."

Dunstan said the ramifications could be serious.