Thread: Chart speed

Match with speed of boat is what I do. Gives you better detail and you can make out what you are looking at better. My 2 cents.

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Originally Posted by 2boatjoe

Match with speed of boat is what I do. Gives you better detail and you can make out what you are looking at better. My 2 cents.

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Thanks. Is there a chart for how fast you are going compared to the chart speed number? Or is it just something you learn?


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For SI and DI Chart speed matching boat speed gives the best results ... This is simply because the Sonar beams in SI and DI are very thin front to back ...so the ratio of data collected in a single imaging sound pulse ("Ping") equates to the measure of forward travel in the boat ... (think of how a MRI takes slice pictures of the human body and then "stacks" them back together to make a "whole body" picture) ...

2d Chart speed is a different animal and should be maxed out to get the echoes to "stretch" across the 2d display ...

Rickie

Originally Posted by sds888

Thanks. Is there a chart for how fast you are going compared to the chart speed number? Or is it just something you learn?


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Think of the chart speed numbers as mph. If you are going 3 mph, set chart speed on 3. If your at the bow barely moving, chart speed at 1-2 will give better down images and side images.

the only exception I have found was with Garmin.....set on highest speed (Ultra), DownVu and SideVu appear less "squished"

Edit: Squished, not stretched

Thanks everyone.


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Originally Posted by rnvinc

For SI and DI Chart speed matching boat speed gives the best results ... This is simply because the Sonar beams in SI and DI are very thin front to back ...so the ratio of data collected in a single imaging sound pulse ("Ping") equates to the measure of forward travel in the boat ... (think of how a MRI takes slice pictures of the human body and then "stacks" them back together to make a "whole body" picture) ...

2d Chart speed is a different animal and should be maxed out to get the echoes to "stretch" across the 2d display ...

Rickie

I don’t have time to check but figured I could ask. If showing split screen on a Helix unit can the chart speeds be different for the two images displayed?


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