Take a look at that when you have time. I do not know what various menus are called in English because I got Finnish version, but key settings are custom url data gets sent and setting recording interval 5 sec. also might be wise to check other filters that might stop it from sending current location.
magic word you need to get the custom tracking url for that app is maywork
If you open that page with phone's browser you can copy paste it to the app.
you can find link for live/replay map page your dot should poop up.
Timing doesn't mater really. So far there has been just me, so good to see how it works with more thane one user even if not simultaneous.