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Garmin 740s XM Weather and Radio

Old 07-11-2012, 08:30 PM
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Default Garmin 740s XM Weather and Radio

I have a 740 and GXM51 antenna. I just signed up for XM weather and radio and can't find the weather tab or anything that says XM. I've watched videos from this site and saw where these tabs are right on the main home screen. I checked the wires and it looks like everything is connected. Are these tabs missing until the 740 receives the signal sent from XM? What else can I check? What can I check on the 740 to make sure the gxm51 is even connected? I just updated the 740 with the latest software so that shouldn't be a problem.

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Old 07-12-2012, 05:14 AM
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From the main display press Config>System>System Info


You will open into this display if your GXM51 antenna is connected correctly you will see it listed in the bottom two lines by unit ID and XM radio ID. Then select the Weather Subscription Menu seond column to the right on the bottom you will open into theses pages. If you are receiving xm data it will display.



XM Weatrher Data displays............. the numbers to the right of the display indicated how long (minutes data has been received for that particular line item). If you are not receiving data there will be a dash. Your subscription name will be listed in the upper left corner of the display).



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Old 07-12-2012, 06:01 AM
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I didnt see the weather subscription tab under system information but all the other tabs looked like yours. I don't remember what was displayed on the left side of that page. I'll have to check later.

The guy at XM said the gxm51 needed a clear view of the sky and to be left on for up to 45 minutes so that my unit could receive the signal. If something went wrong with that procedure, could that be the reason why I don't see the weather tab? I'm thinking it's not connected correctly since I don't see the weather tab or anything for XM radio. If the XM ID isn't displayed on the left then that must mean it isn't connected properly?

I checked the wires and I'm pretty sure everything was connected but I'll have to check again. One wire from the gxm51 is going to the 740 and the other wire is connected to the aux1 port of the clarion radio. Does that sound right?

Last edited by kmb997; 07-12-2012 at 06:03 AM. Reason: .
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Old 07-12-2012, 06:24 AM
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Do you have the GXM51 connected to a powered N2K backbone?
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Old 07-12-2012, 06:41 AM
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I didn't do the rigging but I think it is. How would I know if it is?
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Old 07-12-2012, 06:54 AM
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I just talked to the guy who did the rigging and he said it should be. I'll have to check to make sure later. If it is connected, what do you think would be the next thing to check?

Thanks for helping
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Old 07-12-2012, 07:12 AM
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Your N2k backbone will have a series of black T conneectors and a yellow power wire that is connected to a power source (see the [picture below). There will be a cable coming from the left connector on the Garmin 740 to one of the T's. The GXM51 will connect to one fo the other T's.


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Old 07-12-2012, 07:22 AM
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I have something that looks like a t connector coming out of the left port of the garmin but I don't think its going anywhere. I think that may be the problem. Will it work without the n2k or is that the only way?
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Old 07-12-2012, 07:25 AM
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No you have to have a powered N2k backbone for the GXM51 to work. The GXM51 is a N2k device. If you don't have one Jim at BOE can hook you up .... cost is $71.00

http://www.boemarine.com/Garmin_NMEA...-010-11442-00/

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Old 07-12-2012, 07:33 AM
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Man since you posted that, I think I bought that from Jim. I need to get back to the boat to check everything. Thanks again
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Old 07-12-2012, 09:10 AM
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Here's a pic of the left port on the back of the 740. the wire connected there is coming from the gxm but there is no yellow power wire anywhere.

Thanks for helping
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Old 07-12-2012, 09:17 AM
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Your pic is too small and I'm not 100%, but I don't believe you can hook two n2k devices together and call it a day.

FWIW, the yellow wire is the n2k network power wire. You should have a row of n2k t-connectors somewhere with a terminator on each end. One of the t-connectors should have a yellow cable plugged into it. This is the power cable for the network. The n2k compliant devices then plug into their own t-connector, which get connected together in a common bus.
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