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gps position lost, gps position aquired

Old 03-05-2015, 05:04 PM
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Default gps position lost, gps position aquired

Ok loved my outdated gps unit Lowrance 522c iGPS. Couldn't afford (wife) to replace this unit with a new SI DI capabilities unit. Well installed a T-top and now my GPS cant find itself. 2sec lost, 2min acquired, 4 min lost, 10sec acquired and so on... By the time I get an external antenna and NMEA 2000 connectors its $300. Cant see putting that kind of money into an 8 y/o unit.
So on to my question. Things have changed in technology alot. I am willing (and approved) to purchase a new unit on a budget. Most of (not all) the humminbirds that I see have an internal gps. Are there a lot of guys out there that have these with a T-top and dont have problems? Has technology overcome this problem? Do any of you currently have a Humminbird with an internal GPS and a Ttop? What models. I know each scenario is different, but I would like to get a 7 inch screen, so any recommendations are welcome.
There is nothing fancy about this Ttop. It houses a VHF radio and an AM/FM radio, a few spot lights and nothing more.
Old 03-05-2015, 05:38 PM
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Originally Posted by sshipman350 View Post
Ok loved my outdated gps unit Lowrance 522c iGPS. Couldn't afford (wife) to replace this unit with a new SI DI capabilities unit. Well installed a T-top and now my GPS cant find itself. 2sec lost, 2min acquired, 4 min lost, 10sec acquired and so on... By the time I get an external antenna and NMEA 2000 connectors its $300. Cant see putting that kind of money into an 8 y/o unit.
So on to my question. Things have changed in technology alot. I am willing (and approved) to purchase a new unit on a budget. Most of (not all) the humminbirds that I see have an internal gps. Are there a lot of guys out there that have these with a T-top and dont have problems? Has technology overcome this problem? Do any of you currently have a Humminbird with an internal GPS and a Ttop? What models. I know each scenario is different, but I would like to get a 7 inch screen, so any recommendations are welcome.
There is nothing fancy about this Ttop. It houses a VHF radio and an AM/FM radio, a few spot lights and nothing more.
I understand if you like the new Humminbird, but all of the brands now have internal GPS antennas. Yes they all work (without adding an external antenna) with T-Tops, even flush-mounted. Now that being said, I have seen in cases that when the T-Top is a "Hardtop" the signal is slower than if you had an external antenna (not in all case but some), but with as fast as the GPS's receivers are today most people with hardtops wouldn't notice a difference unless they installed the antenna.
Old 03-05-2015, 05:49 PM
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Originally Posted by sshipman350 View Post
Has technology overcome this problem?
Yes, but ...

Originally Posted by sshipman350 View Post
Do any of you currently have a Humminbird with an internal GPS and a Ttop? What models.
This is the key question. Not all manufacturers' products are created equally.
Old 03-05-2015, 05:54 PM
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Originally Posted by Pez Vela View Post
Yes, but ...



This is the key question. Not all manufacturers' products are created equally.
True, I've installed a few Humminbirds, Simrads, Lowrances, Raymarines and Garmims under T-tops and none of them had issues grabbing the satellites. Especially the models with GLONASS
Old 03-05-2015, 07:35 PM
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thats all good to hear. sounds so far that i can save about 200-400 by purchasing one with an internal gps. Anymore input from others is welcomed!!!
Old 03-05-2015, 09:20 PM
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Lowrance of that vintage had GPS antenna problems to start with. The new units will all work well. I am running 3 Garmin under a full fiberglass pilot house.

I just went to a boat show, and was most impressed with Lowrance/Simrad. (Even though I upgraded my Garmin less than a year ago….

They are all good. But I would stick with one of the big 4 (Garmin, Lowrance/Simrad, RayMarine or Furuno.)
Old 03-05-2015, 10:44 PM
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If GPS-precision is REALLY important, an external antennae is almost always a better option then the internal ones. I have done some tests in my own small pilothouse-boat with new Simrad, Humminbird, Lowrance and Garmin units and all of them are more precise when using my external antennae mounted outside the cabin, then when used in the cabin with the internal antennae. The difference is around 1,5-3 meters in precision when looking at the trails on a PC. A litle fiberglass is not enough to loose position, but it is enough the loose some accuracy.

The external antennae can also be mounted close to your ducer, and thereby making waypoints dropped due to things you see on the sonar more precise.
Old 03-06-2015, 04:15 AM
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This T-top is cloth. My assumption was the pipe causing this disturbance, not the cover itself, but hey what do i know. Accuracy is the problem. once i'm in the area, i can you the bottom finder to locate it exactly. I just need to ensure when im offshore i can atleast get pointed in the right direction for the way home.
Old 03-07-2015, 07:05 AM
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OK, bought a Lowrance HDS 7 gen 2 "touch" with a LSS 2 transducer. Please don't knock it as I just spent some money and don't want my feelings hurt.
Old 03-07-2015, 05:48 PM
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Great pick, let us know how it works!
Old 03-12-2015, 04:25 PM
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I love it so far. Structure scan makes me feel like im cheating.
Old 03-13-2015, 05:05 AM
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Originally Posted by mahimahi99 View Post
True, I've installed a few Humminbirds, Simrads, Lowrances, Raymarines and Garmims under T-tops and none of them had issues grabbing the satellites. Especially the models with GLONASS
And how did you deduce that? Grabbing satellites is one thing, what the actual affect may be is quite another.

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