On Mon, 18 Sep 2006 11:56:53 -0400, "Bill Kearney"
wrote:

Since this feature
requires rotating and zooming the chart data to match the radar
display, vector charts are clearly the right choice.

Hmmm, no it doesn't. At least not on a Raymarine E-80. I can overlay radar
on top of charts in any orientation. I tend to prefer North up orientation,
but the admiral likes it to rotate with the heading. It's a snap to change
between them.

I agree that it is theoretically possible to rotate the radar image
instead of the chart image. In practice however, virtually everyone
is used to looking at radar images in "heading up" format.

I agree that it is theoretically possible to rotate the radar image
instead of the chart image. In practice however, virtually everyone
is used to looking at radar images in "heading up" format.

There's no theory involved, the E-80 does it. At least from the perspective
that someone that wants to see the radar overlaid on charts can do so while
the charts are being displayed in a 'heading up' orientation. Or if
they're looking at the chart in 'north up' orientation it'll likewise
overlay the radar. We use these two modes all the time.

Uh well, yeah, when looking at *only* the radar scope rings it's rather
standard to see them in heading up format. I think you can show it in north
up mode as well. Although I personally don't see myself ever using it that
way.

Wayne.B wrote:
On Mon, 18 Sep 2006 11:56:53 -0400, "Bill Kearney"
wrote:


Since this feature
requires rotating and zooming the chart data to match the radar
display, vector charts are clearly the right choice.

Hmmm, no it doesn't. At least not on a Raymarine E-80. I can overlay radar
on top of charts in any orientation. I tend to prefer North up orientation,
but the admiral likes it to rotate with the heading. It's a snap to change
between them.


I agree that it is theoretically possible to rotate the radar image
instead of the chart image. In practice however, virtually everyone
is used to looking at radar images in "heading up" format.

I was taught, and always use north up. All of my peers also use north
up. That way the picture doesn't change every time you alter course or
make a small correction. It comes from the days of using parallel index
lines when navigating blind.

Gary

On Tue, 19 Sep 2006 04:15:38 GMT, Gary wrote:

I was taught, and always use north up. All of my peers also use north
up. That way the picture doesn't change every time you alter course or
make a small correction.

Are you talking about radar or charting ?

Wayne.B wrote:
On Tue, 19 Sep 2006 04:15:38 GMT, Gary wrote:


I was taught, and always use north up. All of my peers also use north
up. That way the picture doesn't change every time you alter course or
make a small correction.


Are you talking about radar or charting ?

Both.

On Wed, 20 Sep 2006 03:31:52 GMT, Gary wrote:

I was taught, and always use north up. All of my peers also use north
up. That way the picture doesn't change every time you alter course or
make a small correction.


Are you talking about radar or charting ?

Both.

The vast majority of small boat radars display only in "heading up"
mode.