I'm an avid kayaker, and i'm in the market for a durable, high-quality marine knife.  
Some requirements:
fixed blade - folders are out of the question.  i need quick deployment in case im upside down and submerged.
serrated - it will mostly take on rope and cables, so serrated is the way to go.
corrosion resistance - rust is the enemy
I have my eye on the 
Myerchin Model A500, and was wondering if anyone has any experience with this blade, or can recommend something better?  thanks ets