There are two versions of the app available in the Apple Appstore.

In the full version , for the iPad and Iphone, the current position of the ship is constantly shown on the map and the map will be automatically adjusted to the position.

The Lite Version for iPad and iPphone, is free and works the first 30 days exactly the same as the full version.
After that the vessel will not be shown anymore, all other functions stay the same!