Anchor Pro uses background audio and location update modes to keep you alerted when the application is not in the foreground.
You can specify the allowed area to be a simple circle around the anchor location, or opt for a more advanced area by providing two different distances at specific angles.
If you choose to purchase an Anchor Premium subscription to remove ads and get extra features, payment will be charged to your iTunes Account at confirmation of purchase.
You can review all the data from the main screen or graphically check position on the map where you can also see how the boat moved around — perfect for analysis if the anchor is holding or dragging.
Anchor Pro allows you to set the anchor location directly as you are setting the anchor, or specify the location of the anchor later by providing distance and bearing to the anchor.