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  GPS DGPS/FURUNO 16/1850 ?

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Author Topic:   GPS DGPS/FURUNO 16/1850 ?
Kim posted 07-17-2001 12:37 AM ET (US)   Profile for Kim   Send Email to Kim  
my ? is a (E)- fild antenna or a (H)- field antenna ?
now is the DGPS with / a land singal better than a reg. GPS. ? now what I have herd is the (H) field takes out the interferance. & has no land base single
can some one help me with this , befor I e/m furuno with this ?
thanks kim. PS I'm going to get one of these machines. a 1850DF or 1650DF or 16/1850F
also this machine has a 600rms sounder on the 1650... the 1850 600rms/1kW your choice. the same as the 582 L sounder... what do you think?
triblet posted 07-17-2001 02:48 AM ET (US)     Profile for triblet  Send Email to triblet     
DGPS accuracy is stated as 3-15 feet 95% of
the time. Normal GPS accuracy is stated as
45 feet 95% of the time. WAAS accuracy is
stated as 7 feet 95% of the time.

1. Ask yourself whether you need the
additional accuracy of DGPS or WAAS. Some
do, some don't. If you just want to get
back to the harbor in the fog or dark,
you probably don't. If you are trying to
nail a pinnacle with a top 5' in diameter,
(like me) you do.

2. E-field and H-field antennas are both for
DGPS. You still need the land signal.
E-field antennas require a good earth
ground (not a problem on a boat) and can
be upset by heavy rain. H-field antennas
don't have either of those problems, but
are a bit more expensive. E-fields are
whips, H-fields are mushrooms.

3. Look into WAAS. Probably a touch better
accuracy than DGPS, and zero cost if
supported (it's almost all firmware cuz
the correction signals are delivered via
geosynchronous satellite on the normal
GPS frequencies, but at a higher data
rate, hence a minescule amount of hardware
is required. Downside is that the
WAAS birds are low on the horizon, esp.
on the west coast. All new GPS are WAAS
(Garmin has TWENTY WAAS-enabled models).


Whaletosh posted 07-17-2001 10:38 AM ET (US)     Profile for Whaletosh    
Plus, with a WAAS you get the improved accuracy anywhere the GPs is getting the signal. So if you have a portable WAAS unit you can use it for more than jus t the boat and improve navigation.


Kim posted 07-17-2001 10:58 PM ET (US)     Profile for Kim  Send Email to Kim     
Chuck ; thank you for the reply. I see you are on the west coast also. are you useing a WAAS antenna ?
also do you know if I could use a WAAS antenna on any chart plotter? I'm useing a SI-TEX nav-add 1000 & a (HG7) for a GPS antenna. I do need a better fix as I'm fishing deep water for rock cod.(100 to 200) fathoms. maybe all I need is a new WASS antenna ? for my nav-add 1000 . also may I ask are you useing a c-map or navionics ? thanks agian!
triblet posted 07-18-2001 10:44 AM ET (US)     Profile for triblet  Send Email to triblet     
I have a Garmin 162. I'm currently using
the topographic sheets CD because, at least
here, they have more detail than Garmin's
Waterways and Lights CD. I'm eagerly
awaiting the new Garmin BlueCharts which
should be out on CD in August.

What counts is not a WAAS antenna,
it's the WAAS receiver. The antennas are
identical to normal GPS, the receiver has
very slightly different HW to handle the
higher data rate, and different firmware to
decode the WAAS corrections.

Probably just a new receiver will do the job.
The Garmin 17N is a WAAS-capable receiver for
use with a separate chartplotter.

Again, you need to ask yourself whether you
really need the additional accuracy. 45'
is still pretty good.


Kim posted 07-18-2001 10:39 PM ET (US)     Profile for Kim  Send Email to Kim     
Chuck , I'm not sure I know what you talking about a (cd)
is it a chart/or/ map like c-map/navionics ? minichart(tm)
is the WAAS a grrmin thing? what i'm trying to say is this garmin's DGPS ?
yes I DO NEED a good fix!
I need to be as close as I can be on the spots that I'm fishing.( very deep water)
this why I lookig at the furuno 16/1850 D/or DF unit.
I have had the 1650 with a c-map in it and a 1850 with a furuno/navionics/ bathometrics(s/p) side by side. the c- map was verv good! and that is what I'm useing now with my si-tex. but in the furuno plottters, I think the speed of the navionics moved faster. well I'm getting off topic here.
have you looked at eather of these ploters/or know any one who use's one.
PLEASE excuse my spelling (s/p) ... and thanks again.

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