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All GPS ant. Created Equal?

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Old 08-05-2010, 10:09 PM
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Default All GPS ant. Created Equal?

I did a search for Gps and came up with zilch...

So are all GPS antennas created equal...And can they be used with a different make chartplotter screens? I noticed that Raymarine has the 125 plus coming out this month and Furuno has a system coming out this month.

So Basically, who makes the most accurate/reliable Gps antenna?

Thanks
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Old 08-05-2010, 10:43 PM
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gps accuracy depends on the number of channels.

the more channel the better the accuracy. especially when under heavy cover.

example. RayMarine RS125 is a 12 channel. Garmin GPS76CSx is 12 channel. Fastfind 210 is 50 channel. ACR AquaLink is 66 channel.
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Old 08-05-2010, 11:54 PM
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UaVaj thanks for your reply.
So to stay in the context of chartplotter gps antennae...the new lowrance LGC-4000 which has 16 channels is a better antennae than either the raymarine or the garmin models you mentioned? 16 has been the highest I have found...anybody know of a better one?
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Old 08-06-2010, 02:05 AM
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Originally Posted by UaVaj View Post
gps accuracy depends on the number of channels.

the more channel the better the accuracy. especially when under heavy cover.

example. RayMarine RS125 is a 12 channel. Garmin GPS76CSx is 12 channel. Fastfind 210 is 50 channel. ACR AquaLink is 66 channel.
A bit lost there. Accuracy is not based primarily on the number of channels but the actual geometry of the satellites.

All this 50 channel and 66 channel is fine but with pure GPS which is what most recreational receivers really are a waste of channels as with only 30 odd GPS satellites (typical) there will only ever be 12-14 or so (max) in view at any one time. These receiver are designed for future proofing when some other systems come on line but that will be quite some time away so don't be fooled by the number of channels.

WAAS will make use of extra channels but lets face this isn't a big deal either with the number of WAAS geo's currently on line.
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Old 08-06-2010, 03:39 AM
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Not to hijack the thread, but your GPS will get you to a spot where you or somebody else caught fish or plotted likely looking structure in the past.
The GPS is the first step. A powerful sounder is the next. I know a person with a crappy hand held GPS with a tiny screen that you can barely see who gets out to his marks, or nearby............................................ .............

AND then cranks up a Furuno 1100 with a 2kw ducer that shows not only the fish but their name. And the 1100 is a superceded unit.

Finding & catching fish is not about the GPS. All GPS do the same thing. Sort of. But not all fishinders are equal. Some are way more equal than others.
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Old 08-06-2010, 04:01 AM
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Originally Posted by Storm Chaser View Post
UaVaj thanks for your reply.
So to stay in the context of chartplotter gps antennae...the new lowrance LGC-4000 which has 16 channels is a better antennae than either the raymarine or the garmin models you mentioned? 16 has been the highest I have found...anybody know of a better one?
16 has been the highest I have found...anybody know of a better one?
Well yes I do but it doesn't have 16 channels but then it doesn't need 16 channels either to be usefull for what it does then again I doubt you would pay 10 grand for just an antenna but this is the reality, not all antenna's are equal but then neither do they have to be at individual user requirements.

One really has to forget this myth that the number of channels is directly related to accuracy or any form of quality, not so.
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Old 08-06-2010, 06:47 AM
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Originally Posted by Storm Chaser View Post
I did a search for Gps and came up with zilch...

So are all GPS antennas created equal...And can they be used with a different make chartplotter screens? I noticed that Raymarine has the 125 plus coming out this month and Furuno has a system coming out this month.

So Basically, who makes the most accurate/reliable Gps antenna?

Thanks
This something I've though about. Could you remove the connector from say a garmin 12 channel GPS antenna or module and splice on a lowrance connector and use it with a Lowrance GPS unit which requires a 12 channel antenna and vice versa?
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Old 08-06-2010, 08:40 AM
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The simple answer to your op is no. Not all "GPS antennas" are created equal. Actually there are two basic groups. Those who are antennas only and those who are "sensors" (combo antenna & receiver). Units that connect via coax cable only are antennas and the GPS receiver is in the display or below decks unit. If it uses a multiconductor cable then it's a combo and typically sending NMEA data. In actuality, most "antenna only" units are pretty similar and often can be interchanged or replaced with a generic antenna. If your GPS is looking for NMEA data from the antenna/sensor you can supply that data from any source as long as the data sentences are the same. Simple questions don't always have simple answers....
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Old 08-06-2010, 04:56 PM
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Thanks for all the replies...I asked this question basically to find out if I should update my lgc-3000 (lowrance gps antennae). I know sometimes satellites are changed and therefore older model antennae cannot locate the new ones as they have a different designation. How do I find out if my antennae picks up the newer satellites w/waas?

Thanks again.
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Old 08-06-2010, 05:21 PM
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Update rate can be important for accuracy particularly at speed. I believe the new Lowrance LGC4000 has a better update rate than most. Check the web sites to be sure.

The Lowrance LGC 4000 is a GPS receiver as well as a GPS antenna as are just about all of them as far as I know.
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Old 08-06-2010, 08:34 PM
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Originally Posted by Butch Davis View Post
Update rate can be important for accuracy particularly at speed. I believe the new Lowrance LGC4000 has a better update rate than most. Check the web sites to be sure.

The Lowrance LGC 4000 is a GPS receiver as well as a GPS antenna as are just about all of them as far as I know.
Butch,
the lgc-4000 has an up date rate of 5 times per second using the new HDS receivers, but does anyone know the comparison between the lgc-3000 and the lgc-4000 on an older Lcx113chd receiver?
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Old 08-07-2010, 08:14 AM
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The update rate of an LGC4000 should be the same regardless of the device to which it is attached, ie. LCX-113. The LGC3000 has a lower update rate but I don't know what it is.

Call Lowrance to verify before taking what I've said to the bank.
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Old 03-11-2012, 06:16 AM
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Originally Posted by Butch Davis View Post
Update rate can be important for accuracy particularly at speed. I believe the new Lowrance LGC4000 has a better update rate than most. Check the web sites to be sure.

The Lowrance LGC 4000 is a GPS receiver as well as a GPS antenna as are just about all of them as far as I know.
There is some good info here. Now to take it just a bit further, I have the lgc 4000 antenna and have upgraded from the lowrance unit i had to a raymarine e120classic. Do any of you folks know if the lgc 4000 can be used with the e120? and what is the correct wiring? Thanks.
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