Thread: Bow Mount sonar unit- SI, DI, 2d, or something else?

I'm running SI at the transom (999)
DI at the bow (859) along with TM 360.

I like the 360 but do not use it to it's full capabilities because of the screen size on the 859 BUT that is soon to change!!
Plan on mounting another screen (H 12 maybe) just for the 360 and use the 859 for a chart screen or 2d.

Originally Posted by BobB

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If you paired a Helix DI unit and 360 at the bow with a SI unit at the console utilizing the HDSI transducer on the transom....You would have a setup that would be great for crappie fishing.......If you consider the Ethernet sharing capabilities, you could view the 360 and share the other transducer data .....You'd have everything available from either location. (You could also do this with a Helix at the bow and a 99 series unit at the console.)

My current thinking is a DI unit on the bow (Helix9 DI), SI unit at the council with HDSI, mount a 360 on the transom and ethernet it to both the SI and DI units. Then I have 360 from the bow and council. SI at the council, and DI at the bow. Currently I have a 899HD SI at the council and it supports the 360.

The problem I see with mounting the 360 on the bow is the trolling motor must be in the water to use. With the 360 on the transom I can use it anytime, except high speed.

I like your thinking though. Thanks for planting the seed.

Consider the Helix 10 DI unit instead of the 9 .... It has a higher pixel density and the imaging will be better.

Originally Posted by BobB

Consider the Helix 10 DI unit instead of the 9 .... It has a higher pixel density and the imaging will be better.

Does it really have a higher pixel density, or does it just have more pixels because it has a bigger screen?

The Helix 9 has about 3000 more pixels / square inch than the 9.

The Helix 9 is 800 X 480 and the 10 is 1024 x 600.

I wish i plunked down the extra coin for the helix 10 instead of the 9. A little extra resolution and a touch more screen would go a long ways. More the resolution than anything else.

Originally Posted by BobB

The Helix 9 has about 3000 more pixels / square inch than the 9.

The Helix 9 is 800 X 480 and the 10 is 1024 x 600.

The Helix 10 has a 1" bigger screen then the Helix 9. I expect it to have more pixels, it has a bigger screen. The question is, are there more pixels per line of image on the Helix 10 compared to the Helix 9? I did the math. Results below.

Helix 9 = 103.66 ppi
Helix 10 = 117.51 ppi
That certainly isn't 3000 more pixels per square inch. More like 13.85 more pixels per square inch, or roughly 13%.

Is the Helix 10 DI worth $300 more than the Helix 9 DI?

How to do the math.
https://en.wikipedia.org/wiki/Pixel_density
Calculation of monitor PPI

Here is the way I calculated it ....

Helix 10:
8.75" horizontal x 4.9375" vertical = 43.203 square inches.
1024 pixels x 600 pixels = 614,400 total pixels.
614,400 pixels divided by 43.203 Sq inches = 14,221 pixels per sq inch for the Helix 10.

Helix 9 :
7.75" Horizontal x 4.25" vertical = 32.9375 Sq. inches.
800 pixels x 480 pixels = 384,000 total pixels.....So the Helix 10 would have 230,400 more pixels than the Helix 9.
384,000 total pixels divided by 32.9375 Sq. inches = 11,685 pixels per sq inch for the Helix 9.

So, 14,221 - 11,685 = 2,536 pixels per sq inch difference between the Helix 9 and the Helix 10.

I rounded the 2,536 up to 3000 as a rough number......I have no idea what that ppi designation means.

With a combination of the larger square inches and the higher pixel density, the Helix 10 screen clarity will be a lot better than the Helix 9. This theory has been verified by people who have used both.