Check out my website:
On this site, there is a fixed position div #nav. In order to optimize the site for mobile, I am using JavaScript to hide the browser's chrome. Here's the code snippet:
setTimeout(function() {
window.scrollTo(0, 1) },
100);
However, I have encountered a bug when viewing the site on an iPhone 3G, iPhone Retina, and iPad. If you click on '1' on the front page to navigate to the third section, then scroll down and click '< Map' to go to the map section, the nav with the text '< Filters' is not in the correct position. It only jumps to the right place when you scroll up or down the page.