Thread: Humminbird GPS Question

I was thinking about the speed of the gps on the 997, 797, and if you had more channels on the receiver wouldn't that give you faster response time ?Plus improve the accuracy. I have bought the garmin ex legand but prefer to not have to carry the extra equipment if I can get the 997 Gps to respond in a reasonable time frame.

Originally Posted by howferg

I was thinking about the speed of the gps on the 997, 797, and if you had more channels on the receiver wouldn't that give you faster response time ?Plus improve the accuracy. I have bought the garmin ex legand but prefer to not have to carry the extra equipment if I can get the 997 Gps to respond in a reasonable time frame.

Again, I don't think it has anything to do with the GPS receiver. I have a 16 channel on my Matrix 87c & it works fine. I believe the problem lies in the unit's ability to process the info and update the screen. I believe the units don't have a big enough processor.

You could buy the 50 channel reciever and add it to the unit but I believe other than the accuracy you won't gain a thing. I could be wrong but I doubt it.

JMHO

The new 50 channel GPS receivers are more accurate but they are not going to lock on to any more satellites than the 16 channel receiver. There are only about a dozen GPS satellites visible from North America at this time.

If I mark a spot off to the left or right , I have to turn the boat until I get the arrow pointed towards the marked spot on the gps screen wait until the arrow lines up and stops moving then ease my way in towards the spot and zooming in the closer I get . Am I doing something wrong or is that the same thing you guys are talking about on here?

I gave up on the arrow thing - went back to using it like I did my old
dino Lowrance... I keep it set north up, and if what I want to go towards
is beneath me on the screen, I go south. right of me, east and so on.
As long as you can keep track of which bank is which it works for me.
Just have to stop when you think you're not quite to something yet,
let 'er blink a time or two, and you may find you're already there

Originally Posted by PanMan_VA

The new 50 channel GPS receivers are more accurate but they are not going to lock on to any more satellites than the 16 channel receiver. There are only about a dozen GPS satellites visible from North America at this time.

I believe they are using multiple channels to receive the same satellite, thus the 50 channels. I believe this satellite sharing is done on the agri gps. Some how they massage this data for a more finite fix. They won't share, so I am Swagging. I could be wrong.....

Originally Posted by Cane Pole

I believe they are using multiple channels to receive the same satellite, thus the 50 channels. I believe this satellite sharing is done on the agri gps. Some how they massage this data for a more finite fix. They won't share, so I am Swagging. I could be wrong.....

So that is how they are doing it. Now I understand why they have 50 channel receivers.

Originally Posted by PanMan_VA

So that is how they are doing it. Now I understand why they have 50 channel receivers.

I wish they would share more info.

GPS Babel works real good. Easy to use too. Lots of folks are not aware of this on line converter.

Guess we need to spread the word....

This was the answer explaining the new Hi accuracy receiver/ant from one of the side sites better viewers, not a HB mod.........

RE: [sideimaging] New GPS antenna?


This receiver supports both GPS L1 and Galileo L1 signals (each having about 30 satellites, plus the WAAS sats, and I'm not sure, but it may use ground based stations as well) adding up to way over 50 even though you'll never see more than 50% at anyone time. The 50 channels refers to the number of parallel radio contacts it can maintain, while it can aquire 32 channels at a time, and only ever use 16 actual satellites to compute a position (from the data sheet). The benefit being that it can switch new satellites in instantly as they come into view (because it was tracking them even when they had poor signal strength), and track older ones longer in case you (or they) move back into view.

The above was taken from a U-blox document. I'm not exactly sure what it all means but the bottom line is the high degree of accuracy. And from other sources I understand it has a very fast aquisition time.

Yes supposed to be 3 channels to each satellite so I have been told, Jax

That was what my original thought was ,since it has the extra channels locked on to a stronger signal ,would it (the GPS) be able to update quicker?, Called Hb there is 2 new receivers 1 being the 50 channel and the other called the high accuracy receiver . and the anwser to my question about speed was no as Wiskers said and Pan man, it only gets you closer to the marker . So now I need to leaern to use my ex legend for gps .Great