Author Topic: GPS receiver mounting question  (Read 5525 times)

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Offline geno368

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GPS receiver mounting question
« on: January 02, 2013, 11:31:35 AM »
I have a 898ci hd using a transom mount transducer.  I have the gps puck on the back deck.  I recently purchased a 798ci si hd for the bow and have ordered the ethernet cable and dongle to connect them.  My question is: Should I move the puck to the middle of the boat for more accuracy on waypoints?


Offline sonar2000

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Re: GPS receiver mounting question
« Reply #1 on: January 02, 2013, 06:14:38 PM »
Just depends on the boat length. The gps is not exact and moving may not make any difference in the move or display..I would install the new and then see what happens after you have been up and runnig and compare...
Chuck

Offline LocDown

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Re: GPS receiver mounting question
« Reply #2 on: January 02, 2013, 07:09:14 PM »
Is the 798 going on the trolling motor? If yes, then I would leave the gps separate. If you're just using the 798 as a display then I would leave the gps puck where it is. You kind of want the puck where the transducer is.

Offline Bob B

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Re: GPS receiver mounting question
« Reply #3 on: January 02, 2013, 07:46:18 PM »
I think you got the model # wrong on the 898.  That 898 ci model would indicate an internal GPS which is not availiable on the 898.
 (In the Humminbird model #, the C indicates it is a combo sonar/GPS unit, the i indicates it would have an internal GPS, SI would indicate it has side imaging capability, in the 898 and 998 the HD designation would show it is the 2013 model with the new LED backlit display.)(HD for the 798 would indicate that it is the newer 798 model with ethernet.  If no HD on the 798, it doesn't have ethernet.)

Assuming your 798 model # is correct, it has the internal GPS.  It is also available without the internal GPS.

You want the GPS antenna as close to the transducer as feasible when marking waypoints.  The marked waypoint accuracy gets poorer the further the GPS antenna is from the transducer.
I am getting very long winded here, but it is important to understand what happens when you mark a waypoint.  Assuming you are marking an object when you are directly over it with the sonar (transducer), the waypoint records where the GPS antenna is at the instant you mark the waypoint.....not where the transducer is.  Therefore, the closer the GPS is to the transducer, the more accurate your waypoint will be.

If the 798 is on the bow, and you want to use the 798 to return to a waypoint previously marked with the 898 which has it's transducer and GPS on the transom....using GPS only, the internal GPS in the 798 would be good......The best way to go would be to have a transducer for the 798 mounted on your trolling motor and use the GPS in the 798 at the bow for marking and returning to waypoints, and the 898 transducer and GPS mounted on the transom as close as feasible.
You could share the transducer and GPS antenna from the 898 and use it on the 798, but if the 798 is on the bow, you would be a boat length away from your waypoint.

If it still hasn't clicked for you, search for waypoint accuracy, and you should be able to find more info and some visual presentations that may help.
**Looking for the one that makes it all worthwhile**

Offline LocDown

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Re: GPS receiver mounting question
« Reply #4 on: January 02, 2013, 07:48:21 PM »
I don't think any of the 898 series have internal gps.

Offline geno368

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Re: GPS receiver mounting question
« Reply #5 on: January 03, 2013, 08:55:12 AM »
Thanks for all the responses.  The model I have listed is wrong...it is a 898c si and the other was correct (798ci hd)  I installed the 798 yesterday, but haven't set up the network.  The ethernet cable is installed, but the boat is in my garage and can't get it in my boathouse because the water is too low right now.  I am confused about what info in my 898 can be shared to the 798.  Maps?  Waypoints?

Offline LocDown

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Re: GPS receiver mounting question
« Reply #6 on: January 03, 2013, 12:17:40 PM »
You can share most everything, but not maps. Each unit will require their own map card.

Offline Humminbird_Greg

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Re: GPS receiver mounting question
« Reply #7 on: January 09, 2013, 01:09:30 PM »
The data that can be shared will be in the Ethernet manual.  I believe that one is packaged with each Ethernet cable but if not it can be downloaded from the Humminbird web site.  LocDown is right though: no map sharing.
Greg Walters at Humminbird
gwalters@johnsonoutdoors.com


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