''People have been coming out of the woodwork both internationally and locally . . . media groups, rights groups . . . people from everywhere have jumped to our support,'' Morison told the Foreign Correspondents' Club of Thailand.
''I have found out that people I used to work with have organised a protest in Melbourne. It's wonderful.''
The navy's unprecedented action to pursue Morison and Chutima under Thailand's criminal defamation laws and Computer Crimes Act has prompted widespread criticism, including from the United Nations.
''These are sweeping laws and their use against these terrific journalists will have a profoundly negative impact on media freedom in Thailand,'' said Jonathan Head, president of the correspondent's club and the BBC's correspondent in Bangkok.
There is a possibility that when Morison's supporters are protesting on Tuesday, the journalists who write and publish the Phuketwan news website from the Thai resort island of Phuket may be in jail.
They have been summoned to meet a public prosecutor on Monday, where they expect to be told whether the charges will proceed to court. If the decision is to proceed they are likely to appear before a judge who will probably set bail.
But Morison and Chutima have declared they will stand on the principle of media freedom and not post bail.
''We are prepared to go to jail. This a bad law,'' Chutima told the correspondents' club.
Morison said he was still ''scratching my head'' trying to work out the motivation of the navy in launching the action that could lead to him and Chutima, his partner, facing a maximum of five years in jail and fines if convicted under the Computer Crimes Act, and up to two years' jail if convicted on criminal defamation charges.
The charges relate to a story published in Phuketwan in July that quoted a Reuters investigation alleging that some members of the Thai military were involved in smuggling Muslim Rohingya boatpeople from Myanmar.
The story did not mention the Royal Thai Navy and pointed out those responsible were probably renegades.
Phuketwan, which Morison founded in 2008, has won praise and several journalism awards for its coverage of the plight of the Rohingya, who have been described by the UN as among the world's most persecuted people.
Morison told the correspondents' club there is no doubt that Rohingya who have fled persecution in Burma are dying in secret camps run by smugglers near the Thai-Malaysia border.
''The nightmare goes on without enough light being shed on who is responsible,'' he said.
Morison said it would be ''difficult to defend the charges ourselves for a story that was written by Reuters journalists''.
No action has yet been taken against Reuters, a multinational company which has not commented on the action against the two journalists nor offered any support.
The company has transferred from Bangkok one of the authors of the report. The other lives in Kuala Lumpur.
''We hope Reuters will react in the interests of media freedom if and when they are charged,'' Morison said.
If Morison and Chutima are jailed they will be sent to Phuket's overcrowded jail that was built to hold 700 prisoners but now has almost 2500 inmates. Conditions there are harsh.
Morison sold his apartment in Melbourne to set-up Phuketwan, which provides local and foreign news coverage for Phuket where an average 20,000 Australians holiday each month.
The lawsuit is one of about 1600 defamation cases launched in Thailand in 2013, many of them by powerful interests.
Court records show that of the defamation cases that proceed to trial in Thailand an average of 96 percent lead to convictions, one of the world's highest rates.