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Old 12-23-2002, 05:59 PM
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I'm starting my search for a GPS/plotter,my question is ,will the s/s support poles on the bimini,have an effect on the unit if it has an internal ant.? Many ads say "for use on an "open"boat. Does this just mean hardtops?
Thanks, TOMMY
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Old 12-23-2002, 06:39 PM
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An external antenna is generally always the better option depending on the boat/configuration.

Structural supports will generally affect signals at some time but normally not enough to make any appreciable effect but not all installations are the same.

It's not only the size of the supports but the distance away from the internal antenna as one might imagine the closer the support the larger an arc that is shadowed out.

Since the whole system is dynamic as well as the vessel there's no exact science with obstructions apart from at times it might vary from nothing to something.

Cheers, Kerry.

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Old 12-23-2002, 06:50 PM
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The boat is an aft cabin cruiser,the antenna would have to be mounted on the side, no T top or railings to mount it on. [img]/infopop/emoticons/icon_confused.gif[/img] TOMMY
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Old 12-24-2002, 04:47 AM
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Tommym, you should be fine with a built-in antenna. If you have a permanent hard-top you'd want the external, but even then the internal will still work well. You may have a slight degradation of your signal from a couple of satellites, but since most GPS units get signals from 6-12 satellites your unit should still be pretty accurate.

Chris
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Old 12-24-2002, 05:35 AM
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Try it first using the internal antenna...I believe you'll be alright. I have a T-top with canvas...works well. Personally, with a hard top, T-top or otherwise I would prefer a external antenna. [img]/infopop/emoticons/icon_frown.gif[/img] To answer you question...the support poles should have no effect on the internal antenna. [img]/infopop/emoticons/icon_wink.gif[/img]

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Old 12-24-2002, 06:15 AM
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Thanks everyone, MERRY CHRISTMAS, ..TOMMY
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Old 12-24-2002, 06:56 AM
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Don't sweat it Tommy.

You should be fine with that set-up. Like Kerry said, your boat is very dynamic on the water. Different supports and features will move into signal paths as your boat rotates, pitches, and rolls. With so many satellites, I wouldn't think these issues come into play very often.

Below is a picture of my GPS antenna mounted next to the console grab rail. My unit has never lost a signal (well, it did but once but this was due to the antenna itself going bad). It also locks the satellites in at initial start-up without a problem. I also use a bimini top on occasion without problem.



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