Humminbird Greg and other experienced sonar users

[tommyboyrn]

In the 777c2 i have manual it says when using the dual beam sonar that bottom coverage is 1 x depth or an area equal to your depth. so while in 20ft of water your bottom coverage is 20ft. Is there a way to know your bottom coverage if you fish using the 200 kHz only?

[Cane Pole]

In the 777c2 i have manual it says when using the dual beam sonar that bottom coverage is 1 x depth or an area equal to your depth. so while in 20ft of water your bottom coverage is 20ft. Is there a way to know your bottom coverage if you fish using the 200 kHz only?

20* is a trigonometric function which equates to about 1/3 the depth.

• 20 degrees - 0.35 or roughly 1/3 of depth
• 24 degrees - 0.42 or roughly 2/5 of depth
• 30 degrees - 0.53 or roughly 1/2 of depth
• 40 degrees - 0.72 or roughly 3/4 of depth
• 50 degrees - 0.93 or roughly 9/10 of depth
• 60 degrees - 1.15 x depth
• 70 degrees - 1.4 x depth
• 73 degrees - 1.48 x depth
• 80 degrees - 1.68 x depth
• 90 degrees - 2 x depth
• 100 degrees - 2.38 x depth
• 110 degrees - 2.85 x depth

[tommyboyrn]

thanks cane pole. I appreciate the info.
Tom