If your unit has "Alarm" terminals on it, you can add buzzer/whistle from
Radio Shack. Check the current allowed from the Raymarine unit, get a
buzzer that is a little less current.
Lee Haefele
"Nicholas Walsh" wrote in message
...
My Raymarine alarm is not loud enough, especially on anchor watch. Has
anybody fitted an external alarm which you might hear before their boat
hits the rocks?