hb 997 question

**Cane Pole** · 01-31-2010, 10:57 PM

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When you are running your chart speed a setting 1, does this compress the image any? What ping speed do you use when recording at the lower speeds?

**Jason Halfen #511** · 01-31-2010, 11:23 PM

I don't do very much recording, so changing the ping speed isn't something I've done often.

I see no compression at low chart speeds....as long as I'm moving at a low boat speed. However, image compression does become an issue when chart speed and boat speed are mismatched. Below is a portion of a screen capture that was written with a chart speed of 1 and a boat speed of nearly 6 mph, leading to compression of the objects (8 x 8 log fish cribs) in the image.

**Jason Halfen #511** · 02-01-2010, 08:06 AM

For comparison, this is what that same row of fish cribs looks like when the boat speed and chart speed are correlated correctly. Here, the chart speed is 4 and the boat speed is 5.3 mph.

**Cane Pole** · 02-01-2010, 08:18 AM

I get compression on occasion when recording. This explains why very well. I like pictures.

Thanks

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