this part doesnt work:
To get protection from the wind
and a bit of northerly swell, we have really anchored to close to the beach. To keep an eye on this potential danger
we set another mark on the beach.
This time we change the "Mark Name" to -150, this means that if the boat
comes within 150 meters of this mark, the alarm
is set off. Green circle, OK to be inside. Red circle OK to be outside.