You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
I'm looking for this too. I'm fine with "North up" but it drives my wife crazy. I've been tasked with finding a way to have the default map view be "destination up". Anyone every found a solution for this? Thanks!