I'd be curious to see what Garmin has to say -- like you, often both of
mine are on as a courtesy to the back seat angler.

Assuming a 20 degree cone in 20 feet -- I think the formula is
D = 2 * H * tan(.5*20degrees) or
D= 2 * 20feet * tan(10degrees)

or 7.05 feet diameter --

Out at 30 feet depth you'd be looking at closer to 10 feet which may
come into play with both cones overlaping.



Charles Summers wrote:
With both units of the same type, I was concerned that the "pinging" from
the front sonar would be accidently picked up by the sonar in the rear,
making it give false readings. I recall the Dan's sonar video has a little
quip something about this, so maybe I'll see if I can fast-foreward through
and find it. (It was Dan's video... right?)

17' apart is not far considering the 20 degree cone on the sonar as it
travels down in the water, especially when you are fishing deeper water. The
deeper the water, the further outwards it will read. So, in about 20' of
water it would be about to be picked up by the other unit.

Someone correct me if I'm wrong here...

"Jeff Durham" wrote in message
...

In thinking about how a transducer works, I don't see why that would cause

a

problem, especially, being that far apart. It might be worth a call to
Garmin especially since they are both Garmins and hear what they have to
say.

Whatever you find out, either from Garmin or your own experience, let us
know. I would like to find out.

Jeff

"Charles Summers" wrote in message
...

Currently, I have a Garmin 160 sonar mounted on the console, and

transducer

mounted on the rear of my 17' boat. One the front deck, I have an Eagle

Fish

Easy with the transducer mounted on the bottom of the trolling motor.

I'm

not having a problem with them interferring with each other. However...

When I get my new trolling motor with universal sonar built in, I'm

planning

on getting another Garmin unit for the front. Actually, I'm going to put

the

160 up front and put a 240 on the console. My question is, would the two
Garmins interfer with each other?

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