"If everything goes according to plan, the initial system should, provisionally, be put in place by June 2006," Matsuura told a news conference.

UN Secretary-General Kofi Annan has championed a worldwide tsunami warning system and donors have been willing to fund it since the disastrous Dec. 26 Indian Ocean tsunami.

The alert system has taken centre stage at a UN conference on small island problems, held this week in the Mauritian capital. Thousands of the 156,000 tsunami victims may have been spared had warning reached countries like Sri Lanka, India, Thailand and Somalia before the wave struck.

"We have to have international funding, but the affected countries themselves must make maximum efforts," Matsuura said.

That would include spending money to set up their own local warning systems and alert centres, and helping educate their residents on what to do when a warning comes, he said.

The June 2006 target date was tentative and would only be for the basic internationally-supplied parts of the system, he said. The needed country-level work may lag behind, he said.