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Lowrance DGPS Receiver Antenna

Old 10-22-2011, 08:52 AM
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Default Lowrance DGPS Receiver Antenna

Is this thing worth anything? Been in my attic for years.....would like to pitch it as I think it's outdated but want to make sure.

I have a humminbird 998Csi unit on one boat, and a Lowrance M68C Smap unit on another, would this work with or enhance either of those?



-T
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Old 10-22-2011, 09:15 AM
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Since the introduction of WAAS it has very little, if no value at all.
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Old 10-22-2011, 02:48 PM
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I scrapped mine. No value.
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Old 10-22-2011, 03:25 PM
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That's what I thought guys, appreciate the info. Out to the trash...

-T
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Old 10-22-2011, 04:43 PM
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Now that's what a few guys (and only 2 mind you) might think and generally the thinking is flawed especially when comapring to WAAS.

As a dGPS beacon receiver if it is in working condition would be actually preferred over and above WAAS.

So throwing it out as trash is a little misguided.
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Old 10-22-2011, 04:50 PM
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Originally Posted by tomfl View Post
... Out to the trash...
Where's your trash can? I'll take it. If it still works, that is actually a pretty good DGPS receiver. I have many different DGPS beacon receivers and have found the Lowrance/Eagle behaves very well. I agree with Kerry; LF DPGS beacon corrections are superior to WAAS.

If you still want to throw it out I'll pay the postage, but you can probably sell it on ebay and make a few bucks.
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Old 10-22-2011, 04:51 PM
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Originally Posted by Kerry View Post
Now that's what a few guys (and only 2 mind you) might think and generally the thinking is flawed especially when comapring to WAAS.

As a dGPS beacon receiver if it is in working condition would be actually preferred over and above WAAS.

So throwing it out as trash is a little misguided.
Where were you when I was trying to sell it for little or nothing?

I was no longer using it, could find no one that wanted it even for next to nothing, so in the dust bin it went.
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Old 10-23-2011, 04:18 AM
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If me you, i'll through it in the first trash can I see
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Old 10-23-2011, 03:26 PM
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Originally Posted by khalito View Post
If me you, i'll through it in the first trash can I see
Now why would you want to do that for? Lets not turn this myth into fact based on a couple of people who from all accounts don't really know why
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Old 10-23-2011, 05:16 PM
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http://www.gpsnuts.com/mygps/gps/har...nce%20DGPS.htm
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Old 10-23-2011, 07:54 PM
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That's a good, if dated (SA hasn't been an issue for years), evaluation of DGPS-corrected GPS performance. The resulting performance is, though, the same for virtually any DGPS beacon receiver, not just the Eagle/Lowrance.

Regardless of the DGPS beacon receiver used, the RTCM SC-104 digital output stream, which carries the satellite range corrections transmitted by the beacon station, is identical if the beacon selected is reasonably nearby. [I am, for example, 94 miles from the Tampa beacon, the closest and strongest; I get the same data from any of the beacon receivers I have - and the resulting GPS position corrections are identical, whether I use an Eagle/Lowrance, Garmin, JRC, Leica, or CSI.]

Differences, due to reception errors, arise only when tuning to the weaker signal of a distant beacon or when local interference, often from spherics and lightning, reduces the signal-to-noise ratio. Some beacon receivers are better at capturing and decoding weaker or noisier signals. The Eagle/Lowrance often will capture a distant beacon when the JRC and Garmin can't, for instance. For most of us, though, this is not a frequent circumstance. If you are close to a coastline, chances are good that a beacon is not far away - and any DGPS receiver will supply the same essentially error-free GPS corrections - those transmitted by the beacon station.
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Old 10-24-2011, 04:09 AM
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Is it in fact worth anything? Is this capable of plugging into a current Lowrance gps? Or are you going to have to find an outdated legacy gps that won't be serviced by Lowrance? Chances are the cartography for the older machine that works with are no longer produced as well. The current HDS machines provide an EPE under 15 feet. Are you going to get better with an old DGPS unit?

I can't remember, I had a Garmin with DGPS years ago. I just can't remeber it being fantastically accurate.
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Old 10-24-2011, 04:50 AM
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Originally Posted by slapshotjh View Post
... Are you going to get better with an old DGPS unit?
Certainly, older GPS receivers do not generally perform as well as modern ones but the inference that DGPS is an out-dated technology is incorrect - and most current wired GPS receivers have an RTCM SC-104 DGPS correction data input wire. Check your manual; good chance yours does even if it also boasts of WAAS and you bought it yesterday.

The correction data transmitted by USCG DGPS beacons is accurate to 10cm, about four inches. If your receiver sees the same current constellation as the beacon station does and your receiver processes that data well your indicated position will be pretty accurate, often within one meter, even with current inexpensive GPS receivers.
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Old 10-24-2011, 04:58 PM
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Actually I believe many really don't understand what DGPS (as opposed to WAAS) is all about othewise we would not be seeing some of the comments and assumptions being made? Many also quite frankly don't understand what WAAS is all about but unfortuneately many of the manufacturers have also lost direction on this.

Being a boating site then many probably believe DGPS is limited to USCG and coastal type coverage but this is far from the fact. The National DGPS program is ongoing with coverage as per below.

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Old 10-24-2011, 05:28 PM
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Originally Posted by Kerry View Post
Now that's what a few guys (and only 2 mind you) might think and generally the thinking is flawed especially when comapring to WAAS.
i'll second that. you and becker are the only two waas haters who continue to beat a dead horse. consider the source; kerry is miffed because he can't use waas. because it doesn't work down under. becker has an iron in the fire as he makes money off dgps testing.
all anyone has to do is look up the look up the comparisons to realize that it isn't worth the trouble to mount another antenna and 8' whip on your boat. for the occasional 1 meter difference in accuracy.
besides that, that receiver is only good with lowrance gps receivers. and obsolete ones at that. but you could recycle the 8' whip into a nifty fishing pole.

oh yeah and it's (comparing) not comapring.

Last edited by philgorp; 10-24-2011 at 06:30 PM.
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Old 10-24-2011, 05:57 PM
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Then of course there's the ones who think WAAS and DGPS is all about accuracy or the difference in accuracy.

Now we have another one trying to turn their own misconceptions into fact!
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Old 10-24-2011, 06:21 PM
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Originally Posted by Kerry View Post
Then of course there's the ones who think WAAS and DGPS is all about accuracy or the difference in accuracy.

Now we have another one trying to turn their own misconceptions into fact!
then what purpose would a position correction device be used for if not accuracy? decoration??
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Old 10-24-2011, 06:36 PM
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Originally Posted by philgorp View Post
then what purpose would a position correction device be used for if not accuracy? decoration??
The primary purpose of systems like WAAS, DGPS is a thing called integrity monitoring, that is knowing the position is good in near real-time, the secondary function is improved accuracy.

This is where the recreational use (or is that abuse) of WAAS etc is limited to improving accuracy but really having no idea what the accuracy is.

EPE is also not an indication of accuracy.
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Old 10-24-2011, 07:45 PM
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if you want to get into that discussion go ahead, but it's meanless to 99% of most recreational boaters. who mostly rely on their gps for finding fishing spots or basic navigation. and anyone who can't tell that a marker is closer to their boat than what it shows on their chartplotter should not even untie their lines.
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Old 10-24-2011, 08:15 PM
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Originally Posted by philgorp View Post
if you want to get into that discussion go ahead, but it's meanless to 99% of most recreational boaters. who mostly rely on their gps for finding fishing spots or basic navigation. and anyone who can't tell that a marker is closer to their boat than what it shows on their chartplotter should not even untie their lines.
So you're referring to those boaties that claim WAAS is good to a "few feet" but then you are trying to changing the context of what this discussion is really about, that DGPS is for the trash bin and of no use.

Yes it probably is meaningless to most boaties and that is obvious by some of the comments as they really don't know what WAAS or DGPS is really all about such as comments like
Since the introduction of WAAS it has very little, if no value at all.
and this is what all this discussion is all about, people making BS comments they have very little real background about.
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