Wow - lots of new stuff. My impressions:
I don't like
#16 and
#17's direction - looks like a bottle cap to me.
#15 would make an awesome iPhone app logo. It just doesn't make sense as the company logo though. But
#12 as the company logo with
#15 as an application logo is a good combination. It has the company part in there in a way that doesn't dominate and still relates. That's really good.
#14 looks like a clock. I don't like that symbol. When people are on their boat, they get away from clocks and schedules. Time is supposed to stand still!
Is there any way to bring a "guidebook" concept into
#12's direction?
Other symbols besides helms that are good are anchors, buoys, compass rose's, waves, nautical flags...