Quite right, but to sell a chart and then say you can't use it for navigation suggests the chart is either not fit for purpose and/or not of satisfactory quality...
It's another legal argument you have to win (= higher litigation costs) in the event of you trying to sue them. The more defensive arguments they have the less likely anyone will try to sue them.
/cynic
Is it right that they sell a product they try to absolve themselves of liability for...
ontheplane, I didn't see your post but received an email of volvopaul's reply, above, quoting it. Your post moved me almost to tears. Perhaps not for the obvious reasons, which I won't go into, but it moved me anyhow. To anyone reading this and thinking of selling their boat,,, don't. The...
As long as you have an AA road atlas on board everything will be fine. ;-)
"How do you know if the boat is up to the job?"
Up to what job?
Sailing through a F10 or motoring across a flat calm bay?
That's good news. Don't forget that another safety net for you is to put the Mrs on ebay. 99p starting bids always attract more bidders and with no reserve you'll be sure to be in a position to keep your boat.
If you decide to go down this route be sure to post a link :D
If you are forced to sell the boat I can only see it leading to resentment and disharmony.
I also can't help wondering, in light of your recent health scare, why your Mrs would want you to sell something that you so clearly get a lot of enjoyment out of and that adds to your quality of life...