Author Topic: Hummviewer Cursor Readout  (Read 3642 times)

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Offline bobn

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Hummviewer Cursor Readout
« on: April 29, 2010, 05:38:26 PM »
I am new to hummviewer and thank Martin for this great program.  One point that is not clear is exactly what the cursor readouts at the screen bottom are representing.  On the si view  is the lat/long and depth accurate as you move the cursor or is it  the information at the centerline or boat trail at that point in time.  Also dist.boat: readout mostly stays at zero as cursor moves but shows values at outer edge of si view. Would like an explanation from experienced users, thanks.


Offline RGecy

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Re: Hummviewer Cursor Readout
« Reply #1 on: April 29, 2010, 11:49:15 PM »
Bobn,

Welcome to the forum.  Yes, it is accurate.  There are several measurements taking place and understanding the difference between Horizontal Range and Slant Range is important.  Here is some good reading:  Slant Range distortions and Calculating Waypoints

The range that is Shown on your HB unit is actually called the Slant Range.  By know ing the depth and the slant range, we can calculate the Horizontal Range using the Pythagorean Theorem.

Basically, if the Cursor is in the water column, the Horizontal Range is zero.  The point you are seeing is actually directly under the boat, even though it looks like its out to the side.

Hope that helps.  The important info is in the other post.

Good Luck,

Robert
Humminbird Guru and Forum Administrator


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