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Kona · 03-06-2010, 13:36

Hello reader... I just bought a boat in Hudson Florida... Inside the gulf of Mexico... I intend to bring the boat back home in Canada through the Intracoastal... Unfortunately, I cannot find concise information on where to start... waypoint list, etc... I heard that there is way to cross florida from west to east (vice versa) but cannot find a bit of a clue of an idea of a entry waypoint, nor a chart.

If anyone out there can give a hand I would really appreciate...

Also, I am now only a few days before departure and I cannot find a partner to help me at least up to Norfolk... Do you think a 30 years experience sailot that has over 35,000 miles done can do it alone ???

Thanks

**brak** · 03-06-2010, 18:39

Quote:

Originally Posted by Kona

Hello reader... I just bought a boat in Hudson Florida... Inside the gulf of Mexico... I intend to bring the boat back home in Canada through the Intracoastal... Unfortunately, I cannot find concise information on where to start... waypoint list, etc... I heard that there is way to cross florida from west to east (vice versa) but cannot find a bit of a clue of an idea of a entry waypoint, nor a chart.

If anyone out there can give a hand I would really appreciate...

Also, I am now only a few days before departure and I cannot find a partner to help me at least up to Norfolk... Do you think a 30 years experience sailot that has over 35,000 miles done can do it alone ???

Thanks

I went down ICW from Chesapeake to Florida. It can be definitely done alone with some preparation.

The way to cross Florida is by means of lake Okeechobee canal, it shaves a whole lot off the trip. However, the canal can get very shallow at times (depending on rains, and how the water is managed) so it is wise to check with local authorities. Here is a link to the map location: Google Maps

For ICW travel there are cruisers websites that talk specifically about conditions and issues in various parts of ICW (mostly about where a new shoal is and how to run aground only once or twice a day

)

I think there are quite a few ICW discussions elsewhere on this forum.

cagney · 05-06-2010, 12:47

Marco

I had reason today to check your charts relating to the Samoan Island of Savai'i and noticed a few things. OpenCPN complains about "Chart georef accuracy is poor" for more or less all harbour plans.
For NZ865_6 and NZ865_5 one of the reasons probably is that you treat Gnomonic charts as Transverse Mercator. As Dave has introduced some basic support for polyconical projection, this might be a better alternative until there is proper support for gnomonic projection.

Thomas

GPS-Marco · 06-06-2010, 03:50

Quote:

Originally Posted by cagney

Marco

I had reason today to check your charts relating to the Samoan Island of Savai'i and noticed a few things. OpenCPN complains about "Chart georef accuracy is poor" for more or less all harbour plans.
For NZ865_6 and NZ865_5 one of the reasons probably is that you treat Gnomonic charts as Transverse Mercator. As Dave has introduced some basic support for polyconical projection, this might be a better alternative until there is proper support for gnomonic projection.

Thomas

Ciao Thomas.

all those charts have been extensively tested under OpenCPN 136 and they worked rather well (with no complains, even from ocpn log).

I notice that now 210 has some problem. Well, those charts are the only in NZ set (if I remember well) that are not in WGS84, so they need a DTM parameter in the header different from 0,0. Maybe Ocpn 210 does not handle properly this parameter.

Can I ask Dave to check one of those carts and try to give us back some analisys? I attached here the smallest of those charts (a Mercator one) for convenience.

Ciao, Marco.

Note: I added a shot of 865_6 showing in quilt mode

in PolarView.

GPS-Marco · 06-06-2010, 05:11

Hello. Here is new version of New Zealand Charts Portfolio for you. Changes from V25 to V26 involve ALL maps.

I changed the date format so now OCPN and other SW chan show the date of the latest map update. I also corrected some spelling (New Zeland in New Zealand...)

In the latest month LINZ has released NTMs and updates affecting 9 charts:

NZ5571_1, NZ5571_2, NZ5214, NZ5323, NZ5323_1,
NZ5323_2, NZ7132_1, NZ7132_2, NZ7132_3

If you want them, download the new ChartCal-V26 ( MCE66 - Software ) and rebuild with KapGen all the charts (but first delete the tif files of the above list of maps from /Img folder if you have already downloaded or built them). In the /bin folder you can also find a KapGenAll.cmd script that may halp you: just delete the same tif files from /Img and all charts from /BSB folder before use it...

Of course you can also just download the already built charts file you can find at the same above location ( MCE66 - Software )

Let me know. Ciao, Marco.

bdbcat · 06-06-2010, 10:21

Marco....

Thanks for the chart.

I found a bug in the 2.1.0 that affects all Mercator charts with DTM offsets. A simple typographical error. With this fix, the attached chart georef is fine.

I will have a new Beta in a couple of hours with this patch included.

btw, this chart seems a little off compared to cm93. I would be interested in your comments on this when you see the corrected version soon. I guess we will always wonder about the accuracy of cm93 in cases like this....

Thanks again for all the effort on the NZ portfolio.

Dave

kerrydeare · 06-06-2010, 10:36

Quote:

Originally Posted by bdbcat

... I will have a new Beta in a couple of hours with this patch included ... Dave

Dave, why don't you take 15 minutes for lunch, and then get back to us (smile)?

dacust · 06-06-2010, 11:34

Someone e-mailed me a couple more links to another stretch of the Danube.

The links can be found at the link in my sig, last row of the second section.

This comes close to completing the Danube coverage.

-dan

GPS-Marco · 06-06-2010, 12:34

Quote:

Originally Posted by bdbcat

...
btw, this chart seems a little off compared to cm93. I would be interested in your comments on this when you see the corrected version soon. I guess we will always wonder about the accuracy of cm93 in cases like this....
...
Dave

Hi Dave, these charts are really old and have an unknown datum (even if some WGS84 shifts are sometimes reported). After some tests I was not satisfied so I decided to align those charts (changing the DTM) to Google Maps as much as I could (hoping I've not made errors here...). Maybe not the best solution but I think the only better way would be to go there with a GPS to check georef... Really a good reason to go to Samoa!

Of course I'm really interested on better alignement if you have other type of data source.

Thanks Dave for your effort.

Ciao, Marco.

cagney · 07-06-2010, 10:09

Quote:

Originally Posted by bdbcat

Marco....

btw, this chart seems a little off compared to cm93. I would be interested in your comments on this when you see the corrected version soon. I guess we will always wonder about the accuracy of cm93 in cases like this....

I just checked Marcos Samoa charts with 607a, and they are quite good now. Comparing a couple of points I found good agreement with cm93.
Talking about trusting CM93.....
Last autumn I mentioned in an other thread on this (larger) forum that Ceva-i-Ra, aka Conway Reef, south west of Fiji was totally missing in all editions of CM93.
This is no longer the case. I have had the opportunity to take CM93_2 2010 for a spin. Sure enough Ceva-I-Ra was there. But where exactly? The crowd at cmap must know something that The NZ Hydrographer and the Fiji Government doesn't know about this Fijian reef, because they have placed it 7.2 M Bearing 260 from the official position.

Thomas