first sailed january 2008
Join Date: Mar 2008
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Re: Help me understand nmea 2000 and electronics.
So for instance. Say you were fighting the current. You may be sailing very efficiently and movin through the water at 6 knots, but speed over ground might be 2 knots. Or the opposite. If you are going with the current you could be sailing again at six knots, but moving over ground at 11? Is that right?
If so why is the sore through the water important, wouldn't you really only care what kind of forward progress you are making?
I do feel like I am missing something here.
On ais. I did read a short article on AIS. My understanding is all big ships, the ones you don't want to hit in the fog, register their call sign and show up on ais. So say you have a vhf with ais like the standard horizon 2150. The nmea will link it to your chartplotter and those will then appear on your chart. Showing where they are and where they are heading. You can also go to sleep and set an alarm if you are in the middle of the ocean and it will alert you when a ship comes close. Yes? If that is how it works I completely see the value in it. Especially for the cost. It's not nearly as expensive as radar.
But radars benefit is it detects metal objects and has greater range. Plus it sees weather? I haven't looked into radar yet. That is not on my list for this year.
Thanks as always or the help. I'm getting this. Believe me. Im not stupid. I've just spent the majority of my life not being interested in tech. But I've got the tech bug now. I think years ago getting my iphone was what started it. I really was impressed. I didn't know they were so much more than phones and loved the fact that I could look things up anywhere I was.
I got my first digital camera recently. That I am actually picking up super quick. Maybe because a lot of what I'm learning isn't tech stuff. But things like aperture, shutter speed. I grasp these things lightning fast.
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Last edited by northoceanbeach; 03-06-2014 at 01:49 AM.