"Thank you for your input on the map. We're sorry for any inconvenience this has caused, and we'll fix it right away. You're the only one who's bothered to let us know, and we appreciate it. Thanks again."
That would be the normal response from any normal business, but that's not what we're dealing with here. What I get is 'it's not fixable', 'Recreation dot gov deals with thousands of campgrounds', 'the only error I see is...', and my personal favorite "you're the only one who's complained."
Ah, government employees, masters of excuses and buck-passing.