Just select the island. When you get the detail page showing where everyone is at or viewing.
You will see the page will update on its own without selecting the refresh button on the browser.
I think it is around 5 minutes. just use your wristwatch to time how long it takes to update on its own.
You probably should wait for two times since you may be in between the cycle times.
For example here the detail page is:
https://www.ubbcentral.com/forums/ubbthreads.php/online
