This is the version of HalSail optimised for small devices such as phones.
It does not have the full capabilities of HalSail on larger screens, but you can record times automatically with one click as boats cross the finish line and you can edit timings and result status (DNF, OCS, etc.).
You cannot use it to maintain your boat or class registers or to schedule races. For that you will need to log in with a laptop or other full-size computer.