: "one of the guys i paddle w/ sometimes was jammed up to his armpits in
: his yak in surf"

: I think this is probably just an example of the wrong equipment for surf
: For normal touring the Mariner setup works beautifully and is

he was in an older type river yak and either the pedals broke or his foot slipped off - not the sliding seat setup.

however, i think the pitchpole possibility of surflanding as well as jeff's point about the seat falling out or out of place when upside down, as well as the possibility of the seat jamming forward or being awkward or moving around in a paddle float or assisted type of reentry should cause some reflection.

i would like some kind of detent or release fixing.