Marina Board Exam: In the IALA Buoyage System, buoys with alternating red and green horizontal bands are used to indicate ______.

Marina Board Exam

In the IALA Buoyage System, buoys with alternating red and green horizontal bands are used to indicate ______. 

A. spoil grounds 
B. fishing areas 
C. isolated danger 
D. the preferred channel 

Answer:  D. the preferred channel