@Darren *******
its clear they want me to register when i enter the country, so i do.Thailand Immigration Act 2522 Section 37:
"An alien having received a temporary entry permit into the Kingdom must comply with the following:
...3. Shall notify the police official of the local police station where such alien resides, within twenty–four hours from the time of arrival. In the case of change in residence in which new residence is not located the same area with the former police stations, such alien must notify the police official of the police station for that area within twenty-four hours from the time of arrival.
4. If the alien travels to any province and will stay there longer than twenty-four hours, such alien must notify the police official of the police station for that area within forty-eight hours from the time of arrival...."
Form TM. 30 deals with number 3, which Chiang Mai Immigration began enforcing more strictly around late September 2016
Form number TM.28 (“FORM FOR ALIENS TO NOTIFY THEIR CHANGE OF ADDRESS
OR THEIR STAY IN THE PROVINCE FOR OVER 24 HOURS”)