The Easy Anchor Alarm will help you relax after your anchor is dropped, because you know that your boats movements is being watched! If the boat leaves the safe zone you define an alarm is triggered and notifies you, so you can react in time before the boat drift away.
The Easy Anchor Alarm uses the built in GPS on your iPhone/iPad and checks the current position against the stored anchor position. It keeps running in the background until you turn off the monitoring or terminates the Easy Anchor Alarm.
Many boat GPS’s also has anchor alarm functionality, but are often cumbersome to use. That said it would be wise to use them.
The Easy Anchor Alarm is your backup alarm if your boat GPS fails.
It may be used alone, but two alarms are better than one especially if you plan to stay the night with your anchor dropped.
Please note: "Continued use of GPS running in the background can dramatically decrease battery life."