Definitely let them know your position.
I did the trail race and thought it a bit strange that there was a mandatory kit list, yet a few guys at the start carrying nothing and wearing shorts and t-shirt….
Was also told to follow the gpx by a marshall which I didn’t have on my watch, nor a map as I didn’t think it was necessary but if the conditions were any worse probably would’ve needed.
Great event all in but some improvements could be made which I’m sure the organisers will address for next year.