Before I type and display my ignorance here about the ARPA issue, are we
talking about an 1830 or 1833? I see both mentioned in the trail.
IF I had an 1830 radar, I would want to make sure it has a version 08 or
higher EPROM and the revised modulator board in the scanner. Otherwise you a
prime candidate for blown modulator FETs. To determine the EPROM version,
turn on the radar and during the initial Time Delay before the radar can be
switched to transmit, the Resident Version of the EPROM is displayed on the
CRT. The last two digits on the right indicate the EPROM version. Version
08, 09, etc means an OK system. Version 07 and below, get the modification
done requiring a new EPROM in the display and new modulator board in the
scanner. Back in 1990 Furuno covered this as a warranty item. No idea if it
is still covered.
Compass input to the Furuno is via the gyro inputs and may be from their
AD100 conversion box or a flux gate compass, such as Furuno, KVH, etc. There
was a wiring change in mid production of the gyro connector, so make sure
you have your manual handy to match what you have.
As I see it, for an 1830, NMEA will give you lat/long, speed and
range/bearing to a waypoint.. It is not used for compass. Pin 3 of the
Furuno NMEA cable is receive data +, and pin 4 is receive data -.
Doug K7ABX

"Bruce in Alaska" wrote in message
...
In article ,
"Andy K." wrote:

The ARP11 (10 target ARPA) is listed as an option for your radar. As far
as
the data connection between the GPS and radar, if the Garmin cable is
the
same as most of the others they make it would have some un-terminated
wires
plus the red and black for power. You need the NEMA data cable for the
radar
(the one with the bare ends). Nothing more then connecting 2 wires from
each
cable and setting up the data outputs and inputs on each unit. Sorry I
can't
remember the colors you need to connect and the info is at work.

Andy K.

I am under the impression that ARP is and add on option for all the
small commercial Furuo Radars. I am not 100% sure on that exact model
(1833) but I bet Doug could give us a difinitive answer. Any add on
option is going to cost BIG BUCKS, however and probubly not worth the
cash for a noncommercial users. The standard NEMA input for these type
Furuno Radars is to display the Position Information, Speed, Course over
Ground, and Next Waypoint Bearing and Distance, at the bottom of the
screen in the NAV Info Position. If you want the Waypoint Popsicle to
display on the screen, then you must input Compass Data on the Gyro
Input, and that is a seperate connection from the NEMA Input. All the
Furuno's I have dealt with will NOT accept Compass Data from the NEMA
Data Stream, but only on the Gyro Input.


Bruce in alaska
--
add a 2 before @

In article et,
"Doug" wrote:

Before I type and display my ignorance here about the ARPA issue, are we
talking about an 1830 or 1833? I see both mentioned in the trail.
IF I had an 1830 radar, I would want to make sure it has a version 08 or
higher EPROM and the revised modulator board in the scanner. Otherwise you a
prime candidate for blown modulator FETs. To determine the EPROM version,
turn on the radar and during the initial Time Delay before the radar can be
switched to transmit, the Resident Version of the EPROM is displayed on the
CRT. The last two digits on the right indicate the EPROM version. Version
08, 09, etc means an OK system. Version 07 and below, get the modification
done requiring a new EPROM in the display and new modulator board in the
scanner. Back in 1990 Furuno covered this as a warranty item. No idea if it
is still covered.
Compass input to the Furuno is via the gyro inputs and may be from their
AD100 conversion box or a flux gate compass, such as Furuno, KVH, etc. There
was a wiring change in mid production of the gyro connector, so make sure
you have your manual handy to match what you have.
As I see it, for an 1830, NMEA will give you lat/long, speed and
range/bearing to a waypoint.. It is not used for compass. Pin 3 of the
Furuno NMEA cable is receive data +, and pin 4 is receive data -.
Doug K7ABX

Yep, that's how I remeber it as well Doug. I haven't seen an 1833 in
person, but my assumption (I know...Bad idea) is that the 1833 would be
the same. Maybe Furuno has changed the firmware in the 1833 to use
NEMA compass data, for generating the Waypoint Popsicle, but it hasn't
been the case in any of the previous models.

Bruce in alaska
--
add a 2 before @

In " The Radar Book - Effective Navigation and Collision Avoidance " by
Kevin Monahan, he points out that the compass bearing given by a GPS will be
unstable at low speeds. If you want your radar to show proper compass
bearings and work in the North-up/Course-up modes he says you must connect
to some type of fluxgate or gyro compass. So if you just connect your GPS
NMEA output to your radar it seems you may not get correct heading
information while creeping along at low speed, for example, in fog.

"Gary" wrote in message
...
I saw a few people said something about needing a fluxgate compass. I also
have a Robertson AP3000X autopilot that is connected to a fluxgate
compass.
Am I going to need 3 cables now, or is the GPS most likely connected to
the
fluxgate compass already?


"Gary" wrote in message
. ..
I recently bought a 1995 320 Albemarle Express Fisherman. It has a
Furuno
1830 Radar and a Garmin 220 GPS. In reading through the manuals for
these
pieces of equipment, I have noticed that it's possible to connect a GPS
to
the radar and it will display some nav information on the Radar unit as
well
as having the ability to plot the speed and direction of various targets
on
the radar.

Is this simply a matter of purchasing and attaching some sort of cord
between the units, and if so, where do I get this? I am not sure if they
are fairly universal or do I need to contact one of the vendors for this,
and if so, which one...Furuno or Garmin?

Is there more to it than this? Any idea how much it costs?

Thanks!

Gary

?

On Wed, 27 Oct 2004 18:41:29 GMT, "Gordon Wedman"
wrote:

In " The Radar Book - Effective Navigation and Collision Avoidance " by
Kevin Monahan, he points out that the compass bearing given by a GPS will be
unstable at low speeds. If you want your radar to show proper compass
bearings and work in the North-up/Course-up modes he says you must connect
to some type of fluxgate or gyro compass. So if you just connect your GPS
NMEA output to your radar it seems you may not get correct heading
information while creeping along at low speed, for example, in fog.

"Gary" wrote in message
m...
I saw a few people said something about needing a fluxgate compass. I also
have a Robertson AP3000X autopilot that is connected to a fluxgate
compass.
Am I going to need 3 cables now, or is the GPS most likely connected to
the
fluxgate compass already?


Monahan's book may predate the discontinuance of selective
availability. You have to be going very slowly indeed to make the GPS
track reading less stable than a mag compass nowadays.

It is easy enough to compare on your own boat.





Rodney Myrvaagnes NYC J36 Gjo/a

"Religious wisdom is to wisdom as military music is to music."

In article tZRfd.10435$df2.5362@edtnps89,
"Gordon Wedman" wrote:

In " The Radar Book - Effective Navigation and Collision Avoidance " by
Kevin Monahan, he points out that the compass bearing given by a GPS will be
unstable at low speeds. If you want your radar to show proper compass
bearings and work in the North-up/Course-up modes he says you must connect
to some type of fluxgate or gyro compass. So if you just connect your GPS
NMEA output to your radar it seems you may not get correct heading
information while creeping along at low speed, for example, in fog.

That would very much depend on the GPS, its Position Update Rate, and
internal Math Capabilities. I would suspect that any GPS that updates
faster than every .5 Sec, and has a good floating point processor, would
give good resolution down to at least 2 to 3 knots.

Bruce in alaska
--
add a 2 before @

On Wed, 27 Oct 2004 23:08:51 GMT, Bruce in Alaska
wrote:

That would very much depend on the GPS, its Position Update Rate, and
internal Math Capabilities. I would suspect that any GPS that updates
faster than every .5 Sec, and has a good floating point processor, would
give good resolution down to at least 2 to 3 knots.
=========================================

That is definitely true. With my little hand hand held WAAS unit I
get very good resolution at walking speed, and very rapid update.

"Gordon Wedman" wrote in message
news:tZRfd.10435$df2.5362@edtnps89...
In " The Radar Book - Effective Navigation and Collision Avoidance " by
Kevin Monahan, he points out that the compass bearing given by a GPS will
be
unstable at low speeds. If you want your radar to show proper compass
bearings and work in the North-up/Course-up modes he says you must connect
to some type of fluxgate or gyro compass. So if you just connect your GPS
NMEA output to your radar it seems you may not get correct heading
information while creeping along at low speed, for example, in fog.

Not to mention the huge difference between COG and heading, when on a slow
speed and a tidal current....

Meindert

On Thu, 28 Oct 2004 08:26:05 +0200, "Meindert Sprang"
wrote:

"Gordon Wedman" wrote in message
news:tZRfd.10435$df2.5362@edtnps89...
In " The Radar Book - Effective Navigation and Collision Avoidance " by
Kevin Monahan, he points out that the compass bearing given by a GPS will
be
unstable at low speeds. If you want your radar to show proper compass
bearings and work in the North-up/Course-up modes he says you must connect
to some type of fluxgate or gyro compass. So if you just connect your GPS
NMEA output to your radar it seems you may not get correct heading
information while creeping along at low speed, for example, in fog.

Not to mention the huge difference between COG and heading, when on a slow
speed and a tidal current....

The latter is a relevant concern. I haven't seen a recent GPS that had
a problem at walking speed or even slower, but they do say where you
are actually going, not your heading.

The difference can be considerable in areas with strong currents.




Rodney Myrvaagnes NYC J36 Gjo/a

"Religious wisdom is to wisdom as military music is to music."

I have a Raymarine SL72 Plus radar and a Garmin 182 GPS/chartplotter. I
was at the dock in Bayfield, Wisconsin this summer and a guy came by and
wanted to see my electronic setup. He told me I could interface the two
and promptly crawled under the dash and connected a wire from each
together and that's all it took. He had to change the default setting on
the Garmin, but it works like a charm.

No cables, no nothing. It cost me a beer.

Now when I put the radar cursor on an object it gives me the GPS
coordinates and more.

Capt. Jeff

On Thu, 28 Oct 2004 19:27:02 -0500, Tamaroak
wrote:

Now when I put the radar cursor on an object it gives me the GPS
coordinates and more.

=========================

Ideally you'd like to get course, speed and closest approach.