I have a Vesper system as well, but prefer Anchor
Alert running on Android.
Once the chain is out, I enter the length deployed, adding a bit to account for helm
position being further back. Then here's the good part ....
While applying power in reverse to set the anchor
, I point the phone
to it. The app uses the phone's compass
to calculate the anchor position. When I'm satisfied the anchor is set, I press OK on the app and can now rest easy. There is an independent field to enter the acceptable movement outside the circle before alarming. The display shows where the boat has drifted within the swing circle.
On the downside, I almost abandoned this app because it woke me occasionally with false alarms due to losing GPS
signal in the cabin
. Since swapping phones (to inexpensive Sony Xperia M), it has not failed once in several months' of use.
usage is a bit heavy, consuming about 60% of a full battery
overnight. So I plan to install a USB charger
downstairs and keep it plugged in all night.
A couple of features I have not used are an exclusion zone, and automated alert to another phone
so if you are ashore and the anchor drags it will call you.