At a very low tide I stopped to let someone off at a a dock just full of kelp and crap. I was only going 1/2 nm to another dock when my hi temp alarm went off. Reduced to idle speed for remainder of short trip - buzzer stopped after a minute or so. Raised engine - such enough - crap covering part of water intakes. Questions (1) telltale never let up or faltered during all this (someone was watching it). So what exactly is the telltale showing - I thought it was some portion of the exit water, How does engine overheat at a low speed when there is exit water. And (2) I presume there was no damage done - the engine was run at 600 rpm for 2 minutes to get to safety. I believe the owner's manual says you can run at low speed through a temporary overheat.<br /><br />1993/90deg 225hp