Ok but am installing an AIS which could overlay the targets on the
radar screen and calculates the CPA/TCPA; this turns the standard Marpa
function of the RADAR almost superfluous?

Pascal wrote:
Ok but am installing an AIS which could overlay the targets on the
radar screen and calculates the CPA/TCPA; this turns the standard Marpa
function of the RADAR almost superfluous?


As long as the other ships have AIS, yes.

Take a look at a picture I took on-board last year.

http://tinyurl.com/hpozz (small)
http://tinyurl.com/ebmda (full size)

Look carefully at the left part, which is chart overlayed with radar,
MARPA and AIS enabled. You'll see that the gray tail behind AIS target
A70 is much more straight than the green tail behind the MARPA target MR8.

Btw, yes the ship represented by A70/MR8 did almost hit MR7. They hadn't
seen each other apparently (this was in THICK fog on the middle of the
North Sea). MR7 did a pretty wild maneuver at about 200 yards from MR8.
Unfortunately I didn't take a screendump of that! I later asked the
skipper of MR8 whether he'd seen or heard anything. He said he had not,
and that he maintained careful radar watch: he checked the screen every
10 minutes but didn't see anything...

--
Kees

This seems to be very very cool, but the link you showed here is for
members of the Club only, and I can not access the photos . Can you
send the images to me by e-mail?

Thanks

Pascal

Kees Verruijt wrote:

Take a look at a picture I took on-board last year.

http://tinyurl.com/hpozz (small)
http://tinyurl.com/ebmda (full size)

Look carefully at the left part, which is chart overlayed with radar,
MARPA and AIS enabled. You'll see that the gray tail behind AIS target
A70 is much more straight than the green tail behind the MARPA target MR8.

Kees,

I think we need a link directly to the images, I seem to be getting to
an opening page but don't know where to find the photo. You might be
able to see things we are not because of cookies stored on your machine.

On some web pages, especially those using frames, I find it is sort of
difficult, if not impossible, to send a link to one of images or frames.

Jack

--
Jack Erbes in Ellsworth, Maine, USA - jackerbes at adelphia dot net
(also receiving email at jacker at midmaine.com)

Jack Erbes wrote:
Kees Verruijt wrote:

Take a look at a picture I took on-board last year.

http://tinyurl.com/hpozz (small)
http://tinyurl.com/ebmda (full size)

Look carefully at the left part, which is chart overlayed with radar,
MARPA and AIS enabled. You'll see that the gray tail behind AIS target
A70 is much more straight than the green tail behind the MARPA target
MR8.

Kees,

I think we need a link directly to the images, I seem to be getting to
an opening page but don't know where to find the photo. You might be
able to see things we are not because of cookies stored on your machine.

On some web pages, especially those using frames, I find it is sort of
difficult, if not impossible, to send a link to one of images or frames.

Jack


Hi Jack, Pascal,

The site is running a content management system that sometimes thinks it
needs to send everyone back to the start page. Trying it again usually
fixes it. Sorry about this, but I haven't found a fix for this yet.

I just tried the deep-linked tinyurl, and it happened for me as well the
first time; trying it again did indeed fix it.

I'll try to fix this asap.

--
Kees

Kees Verruijt wrote:

snip
Hi Jack, Pascal,

The site is running a content management system that sometimes thinks it
needs to send everyone back to the start page. Trying it again usually
fixes it. Sorry about this, but I haven't found a fix for this yet.

I just tried the deep-linked tinyurl, and it happened for me as well the
first time; trying it again did indeed fix it.

I'll try to fix this asap.

That got it. My problem was that I was stumbling around trying to find
it, the 2nd or 3rd try on the same link brought it up.

Great info, I was curious to see how it looked and worked.

Thanks

Jack


--
Jack Erbes in Ellsworth, Maine, USA - jackerbes at adelphia dot net
(also receiving email at jacker at midmaine.com)

Jack Erbes wrote:

Great info, I was curious to see how it looked and worked.


Glad you got to see it.

BTW you weren't the only one, 300 hits on this page sofar today...

--
Kees

Hi Kees,

I had made a initial look in the site, it is fantastic, not only
because the AIS. I think that the picture you put there is gold. This
picture only, with your comments from this discussion, must convince
anyone to buy a AIS asap. I will take look in it more often.

Thank You very much

Best Regards

Pascal Goncalves
s/v Navstar
Salvador/BA-Brazil
S 13 00/W 038 27

Kees Verruijt wrote:
Pascal wrote:
Ok but am installing an AIS which could overlay the targets on the
radar screen and calculates the CPA/TCPA; this turns the standard Marpa
function of the RADAR almost superfluous?


As long as the other ships have AIS, yes.

Take a look at a picture I took on-board last year.

http://tinyurl.com/hpozz (small)
http://tinyurl.com/ebmda (full size)

It seems the CMS running the site doesn't like the tinyurls so here are
the full links:

http://www.scanner391.net/e107_plugi...album=35&pos=3

http://www.scanner391.net/e107_plugi...282&fullsize=1

Alternatively, go to http://www.scanner391.net then choose Gallery -
scroll down to Technical Details - AIS.


Look carefully at the left part, which is chart overlayed with radar,
MARPA and AIS enabled. You'll see that the gray tail behind AIS target
A70 is much more straight than the green tail behind the MARPA target MR8.

Btw, yes the ship represented by A70/MR8 did almost hit MR7. They hadn't
seen each other apparently (this was in THICK fog on the middle of the
North Sea). MR7 did a pretty wild maneuver at about 200 yards from MR8.
Unfortunately I didn't take a screendump of that! I later asked the
skipper of MR8 whether he'd seen or heard anything. He said he had not,
and that he maintained careful radar watch: he checked the screen every
10 minutes but didn't see anything...


--
Kees