In article ,
"Steve" wrote:

I'm upgrading from my 1720 to a 1721 MKII radar.. I had this same model on
my last boat and missed many of it's features.
I knew the 1721 was capable of with a compass or gyro input but it was too
expensive to add back then.

However I did learn to get by without 'North UP' that I always had on
shipboard radar..(this was my first pleasure boat radar) So even now I'm
content to do without it Noth UP.

Now I'm adding a Yeoman to my chart table and know that it can communicate
and plot on the 1721 radar, but when I get into the fine print of the
specifications I find that it requires that the radar have compass input
(heading sensor).

I already have a Si Tex flux gate compass with NNEA 183 output and the
spec./hookup info for the 1721 indicates I can interface it with the Gyro
input..

AT Last: Here is my question. If my Furuno 1721 MKII has the heading sensor
hooked up and the Yeoman is proving a plot, does the radar have to be in
North UP display??

I know I can manage it either way, but I would hate to have to reorient my
brain each time I happen to switch off the Flux Gate or Yeoman.

Or should I set everything up so the Radar and Flux Gate are always on
together and get use to North Up again??

Or is it possible that the Yeoman can provide radar plots with the radar
remaining in Bow UP mode?? (seems like it is all relative plotting then)

Confused, need help??

Steve
s/v Good Intentions



Hi Steve,
Furuno Radars need the spacific Gyro or Compass inputs to that
seperate connection in order to do any special displays on the screen.
They don't use any of the data from the NEMA Stream for this input.
When I was building Electronic Suites for Fisherman, (10 Ywars ago or
more) Furuno came out with this input on their Medium and Large Radars,
and I installone of the first intigrated systems on the F/v Inian Queen.
We used the Sitex Dual Fluxgate Digital Compass, as it was the only
reasonably proced device that exported the required signals.
Gyrocompasses are just way to expensive for the under 80ft Fishing
Vessel. At that time the only added advantage was the radar would now
display the WayPoint LoolyPop of the NEMA Waypoint Sentance on the
screen, if the WayPoint was within the selected range of the radar, or
if not the radar would display a heading line to the NEMA WayPoint.
things are much more integrated today, but the Furuno Radar Gyro Input
requirements are still the same. You could check with Don Sr. @ G&L
to see if there has been any change in this by Furuno, but I really don't
think that anything has changed.

Bruce in alaska
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