"No Discharge Zone" showing multiple times on a GPSMAP 640

A No Discharge Zone is an area of water where the discharge of sewage (whether treated or untreated) from all vessels is completely prohibited. When possible, the information about these No Discharge Zones is included on Garmin's detailed BlueChart g2/HD or BlueChart g2 Vision/HD charting.

Many times, the No Discharge Zone warning will be shown multiple times throughout the zone, to ensure the boater is aware of the prohibition. At certain zoom scales on the GPSMAP 640, this will result in the No Discharge Zone message showing multiple times on the screen. Since this warning is built into the map, there is no way to disable or hide it. If the message is cluttering the screen at the current zoom scale, zoom farther in or out of the map, until the data is displaying comfortably.