Garmin gmr 404 用户手册

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This section covers the features and operation of the GMR 404/406.

The GMR 404/406 transmits a narrow beam of microwave energy 

in a rotating 360° pattern. When the transmitted energy contacts a 

target, some of that energy is reflected and returned to the scanner. 

The scanner collects the returned energy to process and display. 

Your GMR 404/406 is operated and adjusted using controls on your 

Garmin Marine Network chartplotter. You can view radar data on the 

Radar Page or as an overlay on the Map Page. All radar controls are 

accessible from both pages.
When you turn on the radar, the status bar shows the message “Radar 

Warming Up” with a countdown to Standby Mode. The countdown 

also appears in the middle of the Radar Page. When the countdown 

reaches 0 (zero), the “Hold FCTN to transmit” message appears.
As a safety feature, the radar enters standby mode after it warms 

up. This gives the operator an opportunity to verify that the area 

around the scanner is clear before beginning radar transmission. It is 

important to remember that the microwave energy transmitted by the 

scanner can potentially be dangerous. 

  CAutION: The GMR 404/406 transmits microwave energy that 

has the potential to be harmful to humans and animals. Before 

beginning radar transmission, verify that the area around the radar 

is clear. The radar transmits a beam approximately 12° above and 

below a line extending horizontally from the center of the scanner. 

Avoid looking directly at the scanner, because the eyes are the 

most susceptible part of the body.

When the area surrounding the scanner is clear, press and hold 

FCtN. The message “Do you want to begin radar transmission?” is 

shown. Select Yes, and then press ENtER.