Looking for a Dingy sailing knife. Mostly to cut ropes and general use, but also needs to be taken out on the water in case of an emergency.

Hi there guys, I'm kinda new to knifes, but I'm an avid sailer.

I thought it's about time I got myself a good knife. Something to help me on land, and god forbid, out on the water.

Because I sail dingys I am often submurged, so the blade bust be able to survive some salt water. It might be needed in an emergancy, so it might be worth thinking about an assisted folder. It needs to be able to cut rope, so a serated edge might be needed. Some way to attach it to my life jacked would be preffered.

I live in the uk, so I'm not sure where I could get it from. But some advice on what brand or model I'm looking for would be nice.

Thanks in advance for any advice!