The course is drawn; boats appear as they load. On mobile data, Light mode updates every 30 seconds instead of every 5.

Watching uses little data: the boats' positions are small updates every few seconds. The map itself uses the most, so Wi-Fi is best if you are watching for hours. Nothing is recorded from your phone.
Set up the race, place the buoys, approve the crews, then follow every boat live and publish the results. Everything lives in the left menu.
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It records what you do until you press Stop, then you check it before anything is sent.
Passwords, sign-in codes, phone numbers, ID numbers and email addresses are stored as •••• before they leave this device. You see them masked in the review.
There is no connection right now. Your report, screenshot and journey are saved on this device. Try again, or leave it: it sends itself when you are back online.
Ask in your own words. I answer from the guides only; if it is not in them I say so.