Re: What sailing knife do you use?
Similar to fryewe, I bought a boning knife and cut if down. The marlinspike I turned on a lathe. For a sheath, I just sewed on up out of leather. Other than needing to make a new sheath after ~6 years of wearing it 120 days/year, it hasn't needed anything. I have probably sharpened it 50 times at this point.
I also carry a leatherman wave for those simple projects where I don't want to bother going and getting out the toolbox. There isn't a lanyard on it because I never really use it in situations where it should have one.