I'd say it's a must read for anyone relying primarily or exclusively on electronic charting today, a pretty comprehensive assessment, and overall an interesting read...

http://www.volvooceanrace.com/static/assets/content_v2/media/files/m36616_team-vestas-wind-inquiry-report-released-on-9-march-2015.pdf

It's rather long, contains a great deal of superfluous information which can be skimmed over without missing much... But it's pretty well organized, and so pretty easy to cut to the chase in regards to the stuff that matters to sailors like us...

For me, this is by far the single most important takeaway, in terms of lessons to be learned (emphasis mine)

"129.
Safe navigation depends upon continually checking different sources of information and,if they do not agree,finding out why. In a harbour this can be a simple check that what you are seeing with your eyes confirms what is displayed on a chartplotter.

There is always a risk if the navigator relies on a single source of data. In preparing major passages most electronic chart presentations should be checked against the paper charts and the Sailing Directions. Unfortunately, the attractive presentation of electronic data creates a misplaced air of confidence in the accuracy of what is presented. There can be a false sense of security and a belief that further checks are not necessary. This can be a mistake.

130.
Producers of electronic charts and navigation software systems provide cautions about the use of their products. As an example, Jeppesen, the manufacturer of C-Map, has the following warning as part of the Jeppesen Data License Agreement:

“UNLESS OTHERWISE SPECIFIED BY NATIONAL MARITIME AUTHORITIES, THE DATA LICENSED HEREUNDER IS INADEQUATE AS A PRIMARY MEANS OF NAVIGATION, AND SHOULD BE USED ONLY AS A SUPPLEMENT TO OFFICIAL GOVERNMENT CHARTS AND TRADITIONAL NAVIGATION METHOD”

131.
Some people dismiss these warnings as ‘the Lawyer’s page’ and what is necessary in today’s litigious society. This may have some validity but it is stated very clearly and the manufacturers of private electronic chart and navigation systems stand by the statements and use them to protect their interests.

132.
The best source of additional information is paper charts with a proven record of the generalisation of dangers between different scales. In particular mid-scale charts are extremely useful for passage planning especially when used in conjunction with Sailing Directions. This demonstrates good seamanship, good navigation and follows the advice of the manufacturers, to identify any dangers and ensure that they are displayed on the electronic navigation systems. The route planning software usually allows the dangers to be noted as ‘race notes’ or ‘pins’ or ‘marks’ that show through on all levels of zoom and draw attention to the danger."

One of the more surprising omissions for me, unless I missed it, was any mention whatsoever of the charted navigational aids - in the form of the lighthouses on both Coco and Albatros Islands - that are visible on the BA chart of the entire western part of the Indian Ocean, and covering the entire route of Leg 2. I still find it difficult to believe that Wouter ever looked at a paper chart while "noting the existence of Cargados Carajos Shoals", and its interesting that none of the other competitors mention a reference to a paper chart as being the source of their awareness of their existence, although one boat noted them after reading the Sailing Directions for that region... It appears all the others were simply 'lucky enough' to have zoomed in a bit further than the guys on VESTAS did...