Because most people don't make use of this function. When anchored in
deep water, because of line stretch and movement of the boat due to
wind and tide changes, this was a useless function for many people.

You must be kidding!

I've lived at anchor most of the time for the last five years, often in
very deep water, and I get great peace of mind from the anchor watch on
my Furuno GP-31. I use the plotter function to see where I dropped the
anchor and then put set a go to cursor point there. The plotter draws
a nice swing arc or circle and the alarm tells me when I move outside
the circle... I dragged anchor three times in five years and the alarm
told me about it each time. Works great in anchorages up to 150' deep
with wind and tide -- been there. Maybe Garmin's function is different
from Furuno's...

-- Tom.

Capt John wrote:
Because most people don't make use of this function. When anchored in
deep water, because of line stretch and movement of the boat due to
wind and tide changes, this was a useless function for many people.

It is certainly NOT useless to me! And it is a feature that was more
functional on the older models than the new ones. A simple software
change could fix that. The anchor drag limit can easily be adjusted for
whatever water depth, and scope you choose. That doesn't make it
useless by any means.

Capt John wrote:
Because most people don't make use of this function. When anchored in
deep water, because of line stretch and movement of the boat due to
wind and tide changes, this was a useless function for many people.

It is certainly NOT useless to me! And it is a feature that was more
functional on the older models than the new ones. A simple software
change could fix that. The anchor drag limit can easily be adjusted for
whatever water depth, and scope you choose. That doesn't make it
useless by any means.

Because most people don't make use of this function. When anchored in
deep water, because of line stretch and movement of the boat due to
wind and tide changes, this was a useless function for many people.

My older Garmin 75 has a setting for distance allowed before alarm. So
stretch and swing can be considered.