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Old 13-06-2010, 17:48   #16
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Hi, Highlander40

I would gladly buy the Maptech Photo Charts if they were available for Mexico. The electronic Mexican charts are not very good and lots of the small anchorages are not even shown. I have purchased several different cruising guides for the area but it would be nice to have the photos integrated with the naviagtion charts. Also the charts are often off by one to two miles.


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Old 13-06-2010, 18:09   #17
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Originally Posted by Viking Sailor View Post
Why would there be a performance hit? Both Windows and Linux are multi-tasking operating systems. That means the when the cpu isn't doing one thing it will do something else. And, as long as the cpu is not running at 100 percent utilization, there is time enough for all tasks to complete with time to spare.

The hit would be at the driver level. Data comes in a byte at a time. It will have to make a copy of the the data and act like multiple serial ports so it can create one stream for each process that wants to read the data. It's the nature of the serial protocol. As long as it's a standard serial driver you get one process connected per port AFAIK. Multi-tasking or even multi-processors doesn't provide any way to change this.

“We are the universe contemplating itself” - Carl Sagan

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Old 14-06-2010, 00:24   #18
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Originally Posted by David M View Post
Is there a way to show a vessels position including heading, COG and velocity vector, overlayed onto a Google Earth image? I would only have a cellular internet connection and at times no internet connection depending on the location. I am figuring I would need to download the images ahead of time.

Does Google Earth have pretty accurate WGS84 positions?
Position on GE - yes (tools menu on GE). The COG, HDG etc - I don't know.

Position accuracy - Hud3 finds it off - I find it spot on - so I guess check against a position fix before you go into the shallows.
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Old 19-06-2010, 02:31   #19
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Originally Posted by David M View Post
Does Google Earth have pretty accurate WGS84 positions?

Google Earth imagery seems to be quite well georeferenced.

Have a look on Marine GeoGarage which overlays NOAA charts upon Google Maps viewer :
GeoGarage - Route Preparation


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google earth

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