Your diary stays in this browser on this device: no account, nothing uploaded. Only a spot's position goes to MET Norway and PacIOOS when weather and waves are fetched. Save a backup file now and then, because clearing browser data erases the diary.
A one-line surf & beach day diary
Write one line when you're out of the water, add who you met and what you did. The day's weather and waves for your spot land on it like a stamp, and every day stays in a timeline to scroll back through.