CNA looks at the critical role of such a disaster warning system, which could be implemented in the next five years. SIMEULUE, Indonesia: Indonesia is working on an offshore tsunami early warning system using GPS to monitor sea level changes. According to the Southeast Asian country’s National Disaster Mitigation Agency (BNPB), this new dynamic system could be implemented in the next five years. This comes as Indonesia marks 20 years since it suffered one of the worst natural disasters recorded