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  #1  
Old 06-02-2011, 07:58 PM
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Javelin360 Javelin360 is offline
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Default HB 788 CI GPS Speed Issues..!
I have a HB 788 CI. I cannot slow troll with these units as the GPS speed jumps all over the place. I realize wind, waves, current, etc can have an impact. However, this is much different. In dead calm water using the trolling motor I can be trolling at .8 but yet the GPS reading will jump from .8 to 1.5, 2.3, back to 1.8, etc. I have to carry my trusty Lowrance hand held up front just to tell what speed I am actually at.
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  #2  
Old 06-02-2011, 10:22 PM
Wyo-eye Wyo-eye is offline
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My 597ci HD seems to do the same thing. 50 channel GPS was advertised as being very accurate. What's the deal?
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Old 06-03-2011, 05:24 AM
Dave G Dave G is offline
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I have the exact same problem with my 2010 798 c si. I just downloaded a new software version from HB and will test it out next week to see if it corrected the problem.
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Old 07-30-2011, 09:42 PM
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788ci, same issues here. It has the newest 5.4 update too. You can turn the unit on while on the trailer and it jumps around. How are you supposed to hold a true speed while trolling?
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Old 07-30-2011, 10:34 PM
montanafos montanafos is offline
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I have the 788ci HD and have experienced no issues with mine. Will watch this thread find out what folks are saying about it.
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Old 07-31-2011, 12:58 PM
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I sent Humminbird an email. I'll post the response when I get it.
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Old 07-31-2011, 01:03 PM
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phowler phowler is offline
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Seems like all these units are of the internal antenna type. Where do you guys have them mounted? Anything that could possibly be blocking the signal? I have the same unit dash mounted in my Reata with zero issues.

I will also be interested to see what the issue is.
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Old 07-31-2011, 05:41 PM
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It's on a tiller boat, with zero obstructions.
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Old 07-31-2011, 05:46 PM
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Javelin360 Javelin360 is offline
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Quote:
Originally Posted by phowler View Post
Seems like all these units are of the internal antenna type. Where do you guys have them mounted? Anything that could possibly be blocking the signal? I have the same unit dash mounted in my Reata with zero issues.

I will also be interested to see what the issue is.
No obstructions blocking the unit. In fact I used it this winter ice fishing and it did the same thing. I was once going 2.5 GPS sitting still on a bucket...truely amazing!
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Old 08-02-2011, 07:25 PM
Ozark Bob Ozark Bob is offline
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Call the help desk. They should not be jumping around. Bob
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