Cruising Sailors Forum Archive
I don't have C-map for that part of the world... 
In Response To: Can Jon or anyone that has these e-charts, tell me the approximate NM distance across this screen shot? 
()
() ...but to my eye, the maximum diameter of the Cargados Shoals outlined in blue, running from SW to NE, appears to be roughly 65-70 NM...
Here's the blog I got that pic from, more information and a better overall perspective here:
http://blog.geogarage.com/2014/12/questions-asked-about-volvo-ocean-race.html
Messages In This Thread
- Video of Vestas Wind grounding released...
- Watching the beginning a second time, one thing is abundantly clear to me...
- Can't help but wonder what they were "checking out..."
- Incredible video. This is copy on YouTube which may view better.
- A crash gybe or tack is probably easier said than done...
- As I look at it, they were on a port tack
- You can bet the remaining 6 VOR boats are running their depth sounders now...
- What a crash! I'm glad they aren't blaming the zooming red herring.
- Doesn't sound like the issue of Zooming is a red herring, at all...
- His mistake, as he says. He checks on paper as well.
- From the sound of it, he looked at the paper chart before they were rerouted
- Hard to believe any reference to a paper chart was made within hundreds of miles prior to the grounding...
- Insurance probably isn't the issue...
- On my freakin' globe too!
- The owner should receive full value insured. That's what it's for, mistakes in navigation, etc.
- I posted an electronic chart on the other thread
- It's almost a carbon copy of what happened
- His mistake, as he says. He checks on paper as well.
- In a press conference this morning, they admitted the simple failure to zoom in sufficiently was the cause...
- Thanks. I didn't listen to the whole things, but ...
- Using the image you posted, Jon, I have a question
- Can Jon or anyone that has these e-charts, tell me the approximate NM distance across this screen shot?
- I don't have C-map for that part of the world...
- Scale on map you requested, Tom.
- Here's another map, it's a bit older...
- Note the light at the southwest end; and, the notes on "Strong Currents.
- Thanks, but I'm curious, how far out do you need to zoom(NM's of visible chart), when only 40 meter depths show?
- Not a lot -- couple of clicks.
- An illustration of the different levels of zooming...
- The lighthouse specs
- Good e-chart academics but I'd like to see the area on their screens and software.
- Sounds like all of the boats are running a routing program called Expedition...
- Wow! A world of potential distractions, for sure.
- "To win you have to finish"
- Seems like your post poses quite a conundrum for your thesis regarding paper charts
- Don't want to speak for the other Jon, but for me e-charts are far from useless, but OTOH raster are far from outdated.
- Well, I'm not proposing that these racers should be navigating solely using paper charts at all...
- I don't think my point is coming across well
- The Notice of the Race requires all boats to carry the "appropriate" paper charts for each leg...
- The fact that the data is there was necessary, but not sufficient. The boat got ahead of the navigator...
- The Notice of the Race requires all boats to carry the "appropriate" paper charts for each leg...
- I don't think my point is coming across well
- Nobody is asking the Volvo boats to plot on paper
- OK, here's an example to try to illustrate my point...
- Don't want to speak for the other Jon, but for me e-charts are far from useless, but OTOH raster are far from outdated.
- Wow! A world of potential distractions, for sure.
- Sounds like all of the boats are running a routing program called Expedition...
- The lighthouse specs
- Just a 'couple of clicks' away.
- An illustration of the different levels of zooming...
- Not a lot -- couple of clicks.
- Here's another map, it's a bit older...
- I don't have C-map for that part of the world...
- Thanks. I didn't listen to the whole things, but ...
- Doesn't sound like the issue of Zooming is a red herring, at all...
- What a crash! I'm glad they aren't blaming the zooming red herring.
- You can bet the remaining 6 VOR boats are running their depth sounders now...
- As I look at it, they were on a port tack
- I am SURPRISED the keal held up....
- This latest vid puts a whole new spin on it...
- A crash gybe or tack is probably easier said than done...
- Another vid, with some different material...
- EAG-Electronically Assisted Grounding-
- Paper vs Electronic
- What's that???
- Correction: Seal and Mud Islands
- I can see that happening. I had to zoom out to 90 NM for those islands to disappear on an ipad.
- At 19 knots, the boat is going through 300 yards in 10 seconds, or so.
- Do you remember the days of, "Oh my god, it's official, I don't know where we are?"
- I remember a few of those times. It was hard over
- I don't think anyone is expecting Volvo racers to plot o paper charts . . .
- I think the navigator(captain) said a last minute change left no time for the usual pre-course strategy?
- That's been debunked, someone over on SA posted a diagram of the original Exclusion Zone prior at the start of Leg 2...
- That's been debunked, someone over on SA posted a diagram of the original Exclusion Zone prior at the start of Leg 2...
- I think the navigator(captain) said a last minute change left no time for the usual pre-course strategy?
- I remember a few of those times. It was hard over
- Sorry, I should have said over 100 yards (316', or so) in 10 seconds
- Do you remember the days of, "Oh my god, it's official, I don't know where we are?"
- At 19 knots, the boat is going through 300 yards in 10 seconds, or so.
- I can see that happening. I had to zoom out to 90 NM for those islands to disappear on an ipad.
- Paper vs Electronic
- Watching the beginning a second time, one thing is abundantly clear to me...
