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Post by schlnrnd on Jul 2, 2022 10:27:47 GMT -5
So I’ve been struggling for two weeks now with a NSS12 Evo2 Simrad unit that has lost GPS connection and radar which I’m assuming is tied to the GPS issue. Researched on THT and Simrad website. Completed multiple hard resets and three system updates with no luck. Bought the same external antenna thinking the puck might have been bad but no luck. Network has power and other devices show up in Sources but can’t seem to locate any satellites. Simrad manual says this unit must be used in conjunction with an external antenna SO my last ditch effort is to replace the chord connecting the external antenna to the network. Any Simrad users that have experienced this please let me know if I’m missing a step or something else to troubleshoot. Everything else on unit is working except the GPS. Shows my boat is sitting just west of Africa.
Also, has anyone used Navionics app on an iPhone for navigation with any success?
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Post by fishnfool on Jul 2, 2022 11:24:07 GMT -5
Is the GPS unit plugged directly into your MFD? Have you tried unplugging that connection and inspecting for corrosion or lose connection?
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Post by electrons on Jul 2, 2022 12:16:07 GMT -5
The gps puck on the EVO2 goes through Simrad's a NMEA2000 backbone. Are there any other devices on the backbone and if so, are they working? If the gps puck is the only NMEA 2000 device on the network you might look to see if the network is getting power. There is one drop from the backbone that will be connected to power and ground, check this to make sure both connections are good and the inline fuse is also good and that there is power passing through it.
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Post by schlnrnd on Jul 2, 2022 12:21:23 GMT -5
When I look at the device list my radar, autopilot and compass are all visible. Wouldn’t that assure the network is getting power? The only think I can’t see is the Garmin 19x external antenna
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Post by schlnrnd on Jul 2, 2022 12:22:21 GMT -5
Is the GPS unit plugged directly into your MFD? Have you tried unplugging that connection and inspecting for corrosion or lose connection? Checked the NMEA for corrosion and the antenna chord. Even installed a new antenna and chord
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Post by fishnfool on Jul 2, 2022 12:29:07 GMT -5
So it's tied into your N2k network? Does the GPS antenna come up under the recognized equipment/network list?
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Post by electrons on Jul 2, 2022 12:29:08 GMT -5
Radar runs on the Ethernet network. Your compass and AP will run through the NMEA 2000 backbone, so you've confirmed that the backbone is getting power. You may have a bad "T" in the backbone. I would suggest switching the gps antenna plug with either the AP or the compass connection and see if the situation changes.
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Post by schlnrnd on Jul 2, 2022 13:27:31 GMT -5
I really appreciate the advice. Thank you. This is the device list. Unfortunately, I attached the new antenna with the new chord to multiple connections and still couldn’t get it to connect.
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Post by schlnrnd on Jul 2, 2022 13:30:57 GMT -5
Lightning is now in the area and chased me away.
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Post by electrons on Jul 2, 2022 14:40:57 GMT -5
You might try this just to see what happens. With the system powered down, remove power from the NMEA 2000 backbone, so that it can't be powered up when the NSS is turned on. Disconnect everything from the backbone except the antenna. Power up the NSS and try to find the NMEA device list, it shouldn't appear since it is powered down. Once confirmed that you're not seeing that put the fuse back and restore power to the backbone with just the gps antenna plugged in. Now recheck the device list and see if the antenna appears. Also, does your NMEA backbone have the terminators installed on both ends of the backbone?
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Post by fishnfool on Jul 2, 2022 21:12:24 GMT -5
You might try this just to see what happens. With the system powered down, remove power from the NMEA 2000 backbone, so that it can't be powered up when the NSS is turned on. Disconnect everything from the backbone except the antenna. Power up the NSS and try to find the NMEA device list, it shouldn't appear since it is powered down. Once confirmed that you're not seeing that put the fuse back and restore power to the backbone with just the gps antenna plugged in. Now recheck the device list and see if the antenna appears. Also, does your NMEA backbone have the terminators installed on both ends of the backbone? You should join the forum, you could prove handy around here.
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Post by abouttime2fish on Jul 3, 2022 8:39:04 GMT -5
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Post by schlnrnd on Jul 4, 2022 10:21:59 GMT -5
Thanks for the tip. I'll give it a try today as I'm replacing the brakes on the trailer. Just to confirm....you have the NSS12 Evo 2? The 7s and 9s have the internal antenna but not the 12 from what I have read.
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Post by schlnrnd on Jul 4, 2022 10:39:27 GMT -5
You might try this just to see what happens. With the system powered down, remove power from the NMEA 2000 backbone, so that it can't be powered up when the NSS is turned on. Disconnect everything from the backbone except the antenna. Power up the NSS and try to find the NMEA device list, it shouldn't appear since it is powered down. Once confirmed that you're not seeing that put the fuse back and restore power to the backbone with just the gps antenna plugged in. Now recheck the device list and see if the antenna appears. Also, does your NMEA backbone have the terminators installed on both ends of the backbone? You should join the forum, you could prove handy around here. I really appreciate the suggestions. I'm going to try this is allowing it to find the satellites doesn't work. Figured I'd give it an hour to locate satellites. I'll post what happens. Thanks again.
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Post by abouttime2fish on Jul 4, 2022 13:10:57 GMT -5
Yes I have the NSS12 evo2.
Remember if your boat is on land, pause the transducer so you don’t burn it up.
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