Live stations
Used to correct the forecast for trips today. Each is checked at most every 10 minutes, and only when someone checks a trip for today. A reading counts only if it's recent enough (limit in brackets); otherwise the forecast is used as is. "Check now" fetches that station right away.
Fuel dock
Read only when someone checks a trip from or back to that marina and the last good read is over 12 hours old; after a failed read, not tried again for 30 minutes. Otherwise the stored hours and prices are used. "Check now" reads it right away. When a read fails, the trip shows the stored ones, with "Last updated" and their date once they're more than 12 hours old.
Last 14 days
How often visitors come back
Trips checked
Visitors
Each browser is one anonymous visitor (shown by the end of its random ID). The same person on a phone and a laptop counts twice. Your own use while signed in isn't counted.