Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 14-12-2009, 13:44   #31
Registered User

Join Date: Mar 2008
Location: Houston TX
Boat: Pacific Seacraft 25 "Turtle"
Posts: 364
Images: 35
Here I was, just yesterday, saying how amazingly accurate my SeaClear charts coupled to a GPS and using the AIS to "watch" ships running up and down the ship channel. I punched the "find boat" button on SeaClear and the chart of the area came up and I zoomed in and was surprised to be able to count the docks pictured on the chart. The blue circle denoting my boat was on the 5th dock 3/4 of the way down the dock and slightly south of the center of the dock. Where was my boat actually? "E" dock, slip 35(of about 50) and the odd numbers are on the south side of the main dock. I was very impressed as this would mean there was less than 10ft of real error in both the chart and the gps reading of my boat. Our USGS and/or NOAA are really doing a bang up job for the most part. I haven't run into anything that wasn't marked on a chart(for me to see) in ages..............m
__________________

__________________
I must go down to the sea again.........
cantxsailor is offline   Reply With Quote
Old 14-12-2009, 14:11   #32
Registered User

Join Date: May 2008
Location: British Columbia, Mexico
Boat: S&S Hughes 38
Posts: 837
Images: 23
Having just sailed the Baja with Navionics,and stopping at nearly every anchorage, I can tell you they are nearly spot on.Only at Isla San Geronimo did it show me on the beach when in fact I was anchored in 25ft.The only other thing I noticed was that Rocas Soledad, south of Ensenada,don't show up as a land mass.Coming into LaPaz, they were bang on.
__________________

__________________
highseas is offline   Reply With Quote
Old 14-12-2009, 14:25   #33
Registered User
 
sded's Avatar

Join Date: May 2006
Location: San Diego
Boat: J40 #33 since 1987
Posts: 228
The Mexican charts are fine until you get South of Mazatlan', where there are no recent surveys. Errors of a couple of miles occur below there. Places like Isla Isabella, Pta Mita, ... aren't even close. Use the GPS points in one of the guidebooks then.
__________________
sded is offline   Reply With Quote
Old 14-12-2009, 16:03   #34
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 17,314
They are not Mexican charts.They were drawn by Columbus, whom today we still DISPUTE to be either Spanish or a Turk. Then there were many re-prints, but never corrections.

Get US Charts. Keep the Mexican ones though - they are cool deco.

b.
__________________
barnakiel is offline   Reply With Quote
Old 14-12-2009, 17:34   #35
Registered User

Join Date: Sep 2007
Location: Cayuga Lake NY - or on the boat somewhere south of there
Boat: Caliber 40
Posts: 1,096
Many of the problems have nothing to do with the datum - I went to Belize last year and had what were regarded as the best paper charts in the area from the British Admiralty. But if you looked at the notes they said that large areas were "based on hand line surveys from the 1840's". There just isnt much you can do about the errors that are incorporated into a chart like that if it is what they used as the basis for the electronic charts.

However, and the original poster mentioned this, there is a cruising guide by Capt. Freya Rauscher which has sketch charts that are right on and waypoints to go with them that are also right on. I was on a charter boat with a raymarine chartplotter and had my handheld Garmin 76csx and neither of them was very good but when I programmed in Capt. Freya's waypoints I was in good shape.
__________________
sck5 is offline   Reply With Quote
Old 15-12-2009, 05:36   #36
Senior Cruiser

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Out there doin' it
Boat: 47' Olympic Adventure
Posts: 2,635
Quote:
Originally Posted by barnakiel View Post
They were drawn by Columbus, whom today we still DISPUTE to be either Spanish or a Turk.
I thought he was Italian.
__________________
Lodesman is offline   Reply With Quote
Old 15-12-2009, 07:40   #37
Registered User

Join Date: Jun 2008
Location: California Coast
Boat: Beneteau Oceanis 331
Posts: 680
Columbus...

Was from San Francisco. He ran a bakery in North Beach. Amerigo Vespuchi, now he was the chartmaker and widely recognized for discovering Modesto and Bakersfield.
__________________
Liam Wald is offline   Reply With Quote
Old 15-12-2009, 08:22   #38
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 17,314
Columbus could not be Italian. Spanish royals at that time would not fund an Italian back then. Remember the EU took off only some five centuries later.

b.
__________________
barnakiel is offline   Reply With Quote
Old 15-12-2009, 11:25   #39
Senior Cruiser

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Out there doin' it
Boat: 47' Olympic Adventure
Posts: 2,635
Columbus

I don't think Italy yet existed as such, but am reasonably confident that Columbus came from Genova(Genoa), which is now in Northwest Italy. If you don't think the Spanish court would commission an Italian, I can't imagine how you'd figure they'd fund a Turk? As I recall there was a bit of a disagreement between the Christians and the Ottomans...
__________________
Lodesman is offline   Reply With Quote
Old 15-12-2009, 13:52   #40
Registered User
 
anglooff's Avatar

Join Date: May 2007
Location: Boat in Panama
Boat: Vandestadt ketch 42
Posts: 357
I must concur with Lodesman.... As to believed birthplace. My history teacher was facinated by his story/life and if memory serves his father (or grandfather) held the honour position of gatekeeper, to one of the then important gates of the old city.

Regards

Alan
__________________
anglooff is offline   Reply With Quote
Old 19-12-2009, 14:08   #41
Senior Cruiser
 
unbusted67's Avatar

Cruisers Forum Supporter

Join Date: Dec 2006
Location: Islesboro, ME
Boat: Looking for a new boat
Posts: 2,196
Images: 24

For an extension to this conversation please view this thread

http://www.cruisersforum.com/forums/...2-a-34140.html
__________________

__________________
unbusted67 is offline   Reply With Quote
Reply

Tags
charts

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Do Mexican Port Authorities Know English? EvermanJ Rules of the Road, Regulations & Red Tape 19 17-12-2009 09:20
From Texas South, Down the Mexican Coast cherrick Atlantic & the Caribbean 4 01-09-2009 18:30
Sailing Mexican waters DavyJones Off Topic Forum 2 02-12-2008 07:01
mexican marinas limmer Pacific & South China Sea 2 12-02-2008 08:32
Good Old Mexican Know-How TaoJones Powered Boats 0 07-12-2007 12:27



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 19:49.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.