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Garmin 498c internal vs. external

Old 03-27-2007, 10:15 AM
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Default Garmin 498c internal vs. external

I am about to purchase a Garmin chartplotter/fish finder for use on my Robalo 2020 but need opinions on whether internal or external antenna is the way to go. There is a small in dash gear box in the center console enclosed by a removable plexiglass cover. It holds the radio and currently a fishfinder. I could fit the GPS sounder in there but then it would have to be an external antenna model - can someone confirm that? does anyone use an internal antenna model under a plastic t-top? or in a console that is partially enclosed? do they fail in these conditions?

If i install an internal antenna model on the dash, it will take more abuse and be harder to see IMHO. Is there a consensus that putting at GPS sounder in the dash in preferable?

thanks.

Old 03-27-2007, 04:14 PM
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Default Re: Garmin 498c internal vs. external

If the box has a top (not the fabric of the t-top) you need the external antenna unit. The internal antenna will "see" through canvas fine, but not a box like what it sounds like you are putting it in.
Old 03-27-2007, 08:10 PM
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Default Re: Garmin 498c internal vs. external

FWIW, plastic and fiberglass are practically "invisible" to the GPS in terms signal. Wood (depending on thickness) and some canvas (most is fine) can cause some loss. The worst are metal and people.
Old 03-28-2007, 10:19 AM
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Default Re: Garmin 498c internal vs. external

I wish the 498 internal had a BNC connector on the back in case you have to add an antenna later. If you've got a nice out of the way place to mount the antenna and don't mind the antenna wire coming to the 498, I'd say get the external antenna.
Old 03-28-2007, 09:30 PM
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Default Re: Garmin 498c internal vs. external

You can't flush mount internal...
Old 03-28-2007, 09:34 PM
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Default Re: Garmin 498c internal vs. external

Think of it this way, if the internal antenna goes bad your paying Garmins flat repair rate. If its external your searching EBAY for a used antenna.. Garmin is gonna cost ya to fix it.
Old 03-28-2007, 09:40 PM
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Default Re: Garmin 498c internal vs. external

I have mine mounted in a box at the top of my dash and have no signal problems at all. It picks up right thru the fiberglass cowl and bimini top just fine.
Old 03-29-2007, 02:40 PM
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Default Re: Garmin 498c internal vs. external

Check out the prices for the 498C at THT sponsor GPSDiscount.com. When I bought mine 2 months ago, they were the cheapest on the web with free shipping (and a free t-shirt!). The price now is $70 cheaper.

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