Furuno 1751 Operator's Manual page 78

6. INSTALLATION
Measurement of Blind Shadow Sectors
The result of the above measurement should be recorded on a blind shadow sector diagram.
Figure 6-26 is an example of a shadow sector diagram for the scanner unit sited as in Figure
6-25. The blind shadow sector diagram should be fbted near the display unit.
BLIND SECTOR
Figure 6-25 Shadows Caused by Objects Figure 6-26 Shadow Sector Diagram