Topic: More info needed to understand just what a HD unit is

[danieloverly]

I had asked before about a 1198 hd because the model # is the same for an hd unit and non hd unit, but in other models like the 998, the model numbers are different and the price is a few hundred more for the hd unit.
So, I am hope someone can tell me more on just what makes a unit a HD unit an how much better is a hd unit than a non one. Thanks

[Trytoofish]

I cant speak to the 1198,but it has been stated by Bird officials,that the only difference between the older 998 and the newer 998 hd is the newer one has a led display.

[Rough House]

I cant speak to the 1198,but it has been stated by Bird officials,that the only difference between the older 998 and the newer 998 hd is the newer one has a led display.

Yep, and to my understanding the 1198 always had an led display.  that's why the numbers are the same.

[rnvinc]

It seems that some big-box stores still post and advertise incorrect model numbers...

The 1198c SI Combo is still the "Official" model number...(no "HD" in the 1198)...

http://forums.sideimagingsoft.com/index.php?topic=5222.msg32770#msg32770

Rickie

[RGecy]

HD just represents the screen definition.

I have been inundated with questions about "What is HD?"

"Definition of High Definition

High Definition is largely a fluid term, taking the shape of a lot of different containers, with the only real meaning being something with a significantly increased picture quality and clarity based on the resolution of the monitor in question. For this reason, High Definition is, in reality, a synonym for high resolution.

High resolution means more pixels in your screen." From About.com

This is not bashing product by any means but to show a comparison of Pixel which equals resolution which equals HD. HD is more a buzz word in electronics and not an actual industry measurement or fact.

Comparison...
5" Screens:
798c - 640v x 640h............HDS-5 - 480v x 480h
Square Screen..................Square Screen

7" Screens:
898c - 480v x 800h...........HDS-7 - 480v x 800h
Rectangular.....................Square Screen

8" Screen:
998c - 480v x 800h..........HDS-8 - 600v x 800h
Rectangular.....................Square Screen

10.4" Screen:
1197c - 600v x 800h........HDS-10 - 600v x 800h
Square Screen................Square Screen

The 7" and 8" Screens are not easy to compare because of the screen physical dimension are not the the same rectangular inches versus square inches. But the 10.4" is the same resolution and size. But look at the 5" Humminbird is clearly more HD because it has more pixels....

The higher the pixels the better target separation and displaying fine data can be seen on the screen. For 2D and Down Imaging Sonar Vertical Pixels is very important because each pixel can represent less are of the water scanned. For Side Imaging Horizontal pixels is more important because each pixel can represent less area.

Here's an example of pixels I like to use. If you have 120 vertical pixels and covering 100 foot each pixel represents 12" of water. 100' x 12" = 1200" of water so each pixels represents 10". If you go to a 240 vertical pixel screen each pixel represents 5" of water. 480 pixels 2.5" of water and 640v pixels 1.875" of water.



This is why Pixels are an important part of seeing fine details like separating baitfish, small limbs on trees, etc.