I've been using a Madfrog TDA since they came out (long before they were in my signature). On my Ride I have the TDA on the track mount, the battery goes in a drybag in the footwell with the extra transducer cable, and the head unit is on a Ram mount above the cup holder.
I have a rudder now, but this is the first time I've had one. Drag is negligible. If on a really long paddle, I too just flip it up.
The way I have mine setup is obviously not good for beach launching, but I never surf launch. So, it's a non-issue. If I did regular surf launches I'd move the battery and extra cable inside the yak.
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Amish Ed
You can't catch it again if it's dead!
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