Humminbird Side Imaging Forums
General => General Discussion => Topic started by: Fay on January 19, 2012, 09:37:16 AM
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Am I correct in assuming the only units that come with internal antennas are shown with "ci" and all with external are shown with "c" in their names. thanks in advance - Fay
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Not sure of the exact meaning but the C could mean charting capabilities....dont know the exact....but am still checking..
Chuck
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Chuck, it looks like the 798 is the biggest screen available with internal antenna. Fay
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The “c” designation means that the unit has a color display.
The “i” designation means that the unit comes with an internal GPS Receiver.
If the unit is labeled “ci” than it is a color display unit with an internal GPS Receiver.
Units that are listed as a “Combo” unit means that it is a GPS Chartplotter type unit (shows maps) and that it comes with some sort of GPS Receiver. If there is no “i” designation; than it comes with an external GPS Receiver.
The 798ci Si and 798ci HD Si units are the only Side Imaging units that we have made with an internal GPS Receiver.
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Where did you find that. I looked all over the HB site.. ::)
Chuck
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Thanks for the help. I am surprised that the wider units don't have the internal antenna option.
There are lots of boats with no really good place for an external antenna. Fay
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Where did you find that. I looked all over the HB site.. ::)
Chuck
Kidneys Chuck… (I’ll have to tell you that joke one day.)
We used to have a FAQ about the unit designations. Maybe it has been removed or changed.
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It was a good questiion. Maybe it should be re-added.
dont want to know about your kidneys.... ;D
Chuck
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Thanks for the help. I am surprised that the wider units don't have the internal antenna option.
There are lots of boats with no really good place for an external antenna. Fay
Fay,
Most of the folks that buy the Si units like to be able to mount the GPS Receivers as close to directly over the transducer as they can to help increase the marking of waypoints from the sonar Views. Having the transducer in one location and the GPS Receiver in another will introduce inaccuracies in the waypoints marked when using sonar.
I would also guess that a higher percentage of larger boats that have cabins would have the larger units versus the smaller ones. If we sold the larger units with internal GPS Receivers than they would have to purchase and mount an external GPS Receiver for the GPS to work.
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It was a good questiion. Maybe it should be re-added.
dont want to know about your kidneys.... ;D
Chuck
This was the best that I could find though it is not the one I was thinking about:
http://www.humminbird.com/FAQ.aspx?ContentId=1870 (http://www.humminbird.com/FAQ.aspx?ContentId=1870)
It was not easy to find either, which means not many others will find it either.
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Is that just for the two units listed or does that description fit all units using a c or ci designation.
My search in FAQ did not get me your results...
Thanks..
Chuck
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It’s for all of the Humminbird units Chuck.
I searched on “Combo” and then had to look at several of the links listed before finding the one that was applicable.
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Its all about search arguments hehe..... ;D
chuck
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Internal GPS for the larger units would be nice for the open boats. One less item to mount.
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My HB unit is a 898 CX SI ...
Greg Is the " X " for international model or have some other significance?
Thanks in advance
Geoff
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Yes Geoff, the “X” designation means that it is an International model.
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I absolutely don't have any proof of this, but this makes sense to me:
The external gps puck has more surface area to catch
satellite signals with. You can also adjust the angle, so it sits
flat against the sky. If you tilt a unit with an internal gps for
better viewing, it may not be the best angle for gps reception.
Since the external puck is pretty large, the receiver is
probably bigger than the internal one.
Also, with the built in gps being so close to the system internals,
you would think that interference could creep in somewhere.
It's my opinion that the external gps would work better than the
internal gps, but like I said, I have no data to prove it.
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+1 to ITGEEK......good observation.... :D
chuck
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I found it a couple of years ago when I first got my new humminbird Unit. Still it's a good question and should remain in the FAQ section where it's easy to find.
I prefer the external type antenna so that I can mount it as close to my transducer as possible. I like to have good accuracy in my GPS way points. I want more accuracy not less. I like to troll along a certain depth and follow a certain depth contour line on the lakes I fish. But I find that the map accuracy is off and I may be trolling in 10 ft of water when I think I'm in 20 ft of water according to my new Lake Master Digital Map. The real 20 ft depth is 40 ft the other side of the lake. I don't like hanging up my expensive crank baits in shallow water while I think that I'm in deeper water. I spent a lot of money getting my crank baits, line counting reels and the Precision Trolling Bible Book so that I can keep my baits in the fish zone and not hung up on shallow water structure.
This was the best that I could find though it is not the one I was thinking about:
[url]http://www.humminbird.com/FAQ.aspx?ContentId=1870[/url] ([url]http://www.humminbird.com/FAQ.aspx?ContentId=1870[/url])
It was not easy to find either, which means not many others will find it either.
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Interesting post. Any idea roughly how big the inaccuracies are Greg, or can be?
Fay,
Most of the folks that buy the Si units like to be able to mount the GPS Receivers as close to directly over the transducer as they can to help increase the marking of waypoints from the sonar Views. Having the transducer in one location and the GPS Receiver in another will introduce inaccuracies in the waypoints marked when using sonar.
I would also guess that a higher percentage of larger boats that have cabins would have the larger units versus the smaller ones. If we sold the larger units with internal GPS Receivers than they would have to purchase and mount an external GPS Receiver for the GPS to work.
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They can be anywhere up to twice the linear distance between the transducer and GPS Receiver (plus the inaccuracy of the GPS system we are allowed to use).
So if I install the GPS Receiver six feet away from the transducer, when coming back to that same waypoint my transducer could be anywhere up to twelve feet away from the structure I marked – all depending on the heading of the boat when the original waypoint was marked and when I returned to it.
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They can be anywhere up to twice the linear distance between the transducer and GPS Receiver (plus the inaccuracy of the GPS system we are allowed to use).
So if I install the GPS Receiver six feet away from the transducer, when coming back to that same waypoint my transducer could be anywhere up to twelve feet away from the structure I marked – all depending on the heading of the boat when the original waypoint was marked and when I returned to it.
Great good to know thanks Greg, I'm mainly an offshore fisherman so 12' isn't too much of an issue as most rocks/reefs are quite substantial. Cheers.
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Good point Nicko.
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Ok, based on the above an 898cx requires an external GPS antenna.
With the latest units having Ethernet along with the Minnkota's having Ethernet can the GPS antenna in the Terrova iPilot be used to supply GPS data to an 898cx via Ethernet?
Thanks,
Geoff
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No Geoff.
Although the Humminbird unit will use the i-Pilot Link's GPS Receiver data for some things, it is not set up to continually use this data for normal GPS operations.
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Thanks Greg,
I can see some very good reasons for not doing this anyway.
Geoff