Just another app recommendation for any boaters out there. I do a lot of boating on the Great Lakes and find this application very useful. I have had the application on my iPhone for a few years and love it, and it can be synchronized with iPhone-iPad-Mac or PC software as well.
This application works best on iPad with Wi-Fi + 3G as it utilizes GPS. You'll need to have an X-Traverse account and puchase the charts that you want, and then you can download them to your iPad, iPhone, and/or Mac/pc. It also automatically updates charts when or if they become available.
The application will automatically open the chart relative to your location, and you can track your route, check water depths, see markers, shoals, etc. You can then export your tracks and waypoints to your X-Traverse account and have all your devices stay in sync.
The total cost can get up there so you'll want to make sure this application is for you. If you are an avid, long distance boater, then I highly recommend it. The application cost is $49.99, the X-Traverse account is $10/year, and to purchase charts it is generally between $50-$100 per set. Like I said, I am a boater out on the Great Lakes constantly in the summer and I make incredible use of this application.
Here's a quick screenshot for anybody curious as to how this looks. This is a shot of a section of Georgain Bay off Lake Huron, issued by the Canadiann Hydrographic Service.
Let me know if anybody else uses this application!