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There’s marking your spot and marking your spot…
Balloons, flag and kites are a no-no but as Ewan says a conveniently bright towel with your shoes on is fine…
As others have said get there early, pick your spot (if allowed) then do a walkthrough of translation several times so you know where you arrive from the swim, where your bike is and where you go out…
The best thing you can do this week is practice transitions…
It explicitly says in the info you are not allowed to mark your spot which seems a bit harsh on glasses wearers! Luckily once I find my bike I’ll find my glasses and my bike has a LOT of purple bits so should be ok