DownScan Imaging / Down Imaging Shoot Through Demystified E-mail
Written by Allen Sansano   
Tuesday, 17 September 2013 18:17

Kayak anglers have long debated whether the Lowrance DownScan Imaging (DSI) or the Humminbird Down Imaging (DI) can be used in a shoot through kayak hull application. Some sources on the internet have even suggested that the manufacturers do not recommend it. KFM went directly to the sources, engaging directly with Lowrance and Humminbird, to get to the bottom of the rumors. The bottom line is that YES, you can use DSI/DI in a through kayak hull application, however, there will be a minor performance loss.

Lucus Steward, Product Manager at Navico (Lowrance parent company) had this to say:

We certainly do endorse shooting DSI through a kayak hull. I have had great success using Marine Goop. There is a small loss in coverage.

Lucas went on to provide some real images to demonstrate the effects. For 800 KHz, side to side (across track) beam width is cut in half when mounted as a shoot through kayak hull. This reduces the amount of coverage you have. The signal is also attenuated significantly. Small targets and thermoclines do not show up. Max depth is also greatly reduced. In the following picture, the right set of images are shoot through kayak hull. The top images are in 35' of water and the bottom images are in 75' of water.

LowranceDSI800

 

For 455 KHz, side to side (across track) beam width is cut in half when mounted as a shoot through kayak hull. This reduces the amount of coverage you have. The signal is attenuated slightly. Small targets and thermoclines show up better at 455KHz than at 800KHz as shoot through kayak hull. In the following picture, the right set of images are shoot through kayak hull. The top images are in 35' of water and the bottom images are in 75' of water.

LowranceDSI455

 

Mark Gibson, the Director of Research and Development at Humminbird, had this to say:

As with any installation inside the hull, there is some loss of signal versus having it mounted directly in the water; however, the amount of loss on the DI due to being mounted in the hull of a kayak using the kit we provide is not very much, and can be easily compensated for by increasing the sensitivity. I ran out yesterday on a kayak in between rain storms, and quickly installed the DI transducer in less than a minute and took these snapshots. You can see the difference, but I didn't try to compensate for sensitivity, so the sensitivity setting is the same for both shots. The shots on the right are from the installation inside the hull. The shots on the left side are from the transducer being directly in the water.

 

HumminbirdDI

 

So there you have it. You can indeed use DSI/DI in a shoot through kayak hull application!

 

 

 

You must be registered to post a comment.


Login

Newsletter

Subscribe here to receive FREE email issues of Kayak Fishing Magazine.

Most Popular

Michigan Kayak Fishing
This month we learn about the people who make up Michigan Kayak Fishing. We'll also learn about their unique fishery and what it means to be a kayak fisherman in this area. It...
Orlando Kayak Fishing Club
The Orlando Kayak Fishing Club was founded in March 2007 and has grown to one of the largest clubs in Florida with a total roster of over 380 members throughout the Central...
The Kayak Fishing Association of New York
The Kayak Fishing Association of New York was founded in May of 2007 to further the sport of kayak fishing with a keen eye on conservation and to promote safe, effective, and...

Random

Lafayette Kayak Fishing Club
The Lafayette Kayak Fishing Club (42 members and consistently growing as of April 16, 2009) is a unique club of men, women and children anglers who fish fresh and saltwater for...
Orlando Kayak Fishing Club
The Orlando Kayak Fishing Club was founded in March 2007 and has grown to one of the largest clubs in Florida with a total roster of over 380 members throughout the Central...
Paddling Anglers in Canoes and Kayaks - PACK History
Paddling Anglers in Canoes and Kayaks formed in March 1998 with about ten enthusiasts looking to share the fun of Gulf Coast fishing from small boats.  Meetings have been...

Latest Kayak Reviews

Lifetime Sport Fisher
 
5.0
Cobra Kayaks Tandem
 
3.0
Perception Sport Pescador 10.0 Angler
 
4.0
Hobie Mirage Outback
 
4.0
Current Designs Tailfin
 
5.0
Hobie Mirage Outback
 
2.0
NuCanoe Frontier 12
 
5.0
Native Watercraft Mariner 12.5 Propel Anglers
 
4.0
Hobie Mirage Outback
 
5.0
Pelican Castaway 100
 
2.0
Stealth Pro Fisha 575
 
3.0
Field and Stream Eagle Talon
 
5.0

Latest Equipment Reviews

Body Glove 3T Barefoot Max
 
5.0
Body Glove 3T Barefoot Warrior
 
5.0
Body Glove 3T Barefoot Warrior
 
3.0
Columbia Drainmaker
 
5.0
Sperry SON-R Sounder Shandal
 
4.0
Garmin VIRB Elite
 
4.0
Polaroid XS100
 
4.0
Backwater Paddles Assault Hand Paddle
 
5.0
Backwater Paddles Assault Hand Paddle
 
5.0
Stohlquist Piseas
 
4.0
Wheeleez Tuff Tire Kayak Cart
 
5.0
Boga Grip
 
4.0