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Post by hullnumbers on Dec 5, 2009 20:54:17 GMT -8
Figure i put in this thread to start seeing whats under neithe our lovely ships. ;D We can also find how far they can go without beaching or grounding.
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Post by Low Light Mike on Dec 5, 2009 21:59:39 GMT -8
I'm not understanding the purpose of this thread.
What are you expecting people (and yourself) to post in this thread?
Please clarify.
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Quatchi
Voyager 
Engineering Officer - CCG
Posts: 930
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Post by Quatchi on Dec 5, 2009 22:10:08 GMT -8
Usually there's seawater underneath our ships, it has a density of about 1.025 g/ml, but when they go into refit at Deas they are in freshwater, it has a density of about 1 g/ml. Usually seawater becomes more dense as you go deeper so the numbers might be a little different for the larger ships than some of the smaller ones. More reading on seawater here: en.wikipedia.org/wiki/SeawaterCheers, |
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Post by hullnumbers on Dec 5, 2009 23:30:16 GMT -8
Well, i was thinking that all ships use this in order to move place to place. It's a real maze on the water because of the tarrain under water. think about it we have one of the most complex terrains in the area. For one thing we have lost many ships including the QotN to the ocean. Some faced being beached and were able to be saved.
With radar in place we can now see whats under neathe.
We can talk about all about the ships of BC that face many challenges because of this. Historic accidents and how we have addapted to the setuation.
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Post by Ferryman on Dec 6, 2009 0:18:16 GMT -8
I know that there's a couple of members on here who would probably be happy to post some images of charts they use for tracking vessels. For example: member DENelson would use Raster Chart software to plot locations of the Super C's as they made their way from Germany.
Radar doesn't show you what is underneath. That is what a Depth Sounder is for, but it does essentially have similar operating characteristics to radar, just in a vertical motion instead of horizontal. Radar is the acronym for RAdio Detection And Ranging, meaning it transmits microwaves which bounce of surrounding objects, and reflects back to the transmitter. This produces an image of your surroundings...in this case things such as your proximity to land, other vessels, and possibly rocks. Radar is tricky to read, as I'm finding with my familiarization of it onboard the 25' Coast Guard vessel I've been doing some training on as of late. Everytime the radar does a sweep, the image will adjust to whatever has changed since the last sweep. However, for a newbie like me, it's nice having a digital electronic charting system right beside the radar to put some more detail to the radar image. The charting system is equipped with Raster Charts and a GPS, which has some fairly high detail of the area, and it even has a little flashing arrow marking where you are. If anyone else here plays the Ship Simulator game, they'll know what I'm talking about.
I've noticed most of our larger ferries are equipped with a similar GPS charting system, and some of which even have AIS characteristics. So think of it as Siitech style charting. However, watchkeepers don't rely on this, because it doesn't show absolutely everything around them. Someone will still need to be looking around for smaller boats such as small pleasure crafts.
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