On Sunday, the boat had stopped on the Thai island of Lanta due to poor weather and re-stocked fuel and provisions before the Thai authorities allowed it to resume its journey toward Malaysia, home to a significant Rohingya diaspora.
This is the first refugee boat in months that has been spotted in the Andaman Sea, where, in 2015, thousands of Rohingya and Bangladeshi migrants were stranded after they were abandoned by traffickers.
Several organisations have warned of a similar exodus as the monsoon season approaches and conditions deteriorate in refugee camps in Bangladesh, where about 700,000 Rohingya have been living in cramped conditions since last year.
The mass exodus of the Rohingya from Myanmar's Rakhine region began on August 26, 2017, after the military launched an offensive.
Myanmar does not recognise the Rohingya as citizens.