Question about Garmin Nuvi 660 GPS Receiver

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Garmin Nuvi 660 GPS Can't find Satellites

Had mine for 9 months then it was unable to find satellites. Sent it back and they said they replaced the antenna. Three months the same problem. Reset does not work. Running down the battery does not work. I am 2 weeks short of 1 year old with this unit. Also problems with Upgrade availability not out until Sept 08. Despite the fact that Eastlink opened June 29th - the largest road infrastructre development in decades. Don't expect a Garmin to be any good.
A useless waste of money. The internet is full of problems with Garmin. Be warned about this products inability to find satellites.

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  • spalding1960 Jul 06, 2008

    I've had this unit for 11 months and it starting acting up two weeks ago. Says it cannot find satellites and then all of a sudden it starts to work. Then I loose it again, very unreliable for what I need. I hope it can be fixed under the warranty.





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Try this and see if it fixes your problem...first disable bluetooth then follow these steps....

1. Power off the unit.

2. HOLD down the power button and you will see "Pre Boot Mode" appear on the lower part of the display. KEEP HOLDING the power button down and the display will flicker, do this until the pre boot mode message disappears. This seems to take a long time (60 seconds at least).

3. Once the pre boot mode message disappears release the power button and your device will perform some activites to recover from the problem.

Posted on Jan 02, 2009

Maybe you are right.. I have a Nuvi 250 and exactly the same problem.. Only I bought it in Perth and unable to do anything in Sydney so far.. Will try once more today. My warranty is up next month! Wish me luck!

Posted on Jul 05, 2008

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Posted on Jan 02, 2017

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External antenna - Garmin 25MCX low profile remote GPS antenna

I have been experiencing the same problem many have been having with the Nuvi 6xx and 3xx series giving an error message “Lost satellite reception”.

My problem started mid April 2008 and got progressively worse. I would use my GPS on weekends and it would work perfectly for the first 10 – 30 minutes and then would loose satellite reception, rendering it useless.

I bought my Nuvi 660 when it first came out in October 2006 for just under $700 and is now out of the 1 year warrantee.
I called Garmin Technical Support and we checked my Software version (4.40) and more importantly my GPS SW version (3.00). According to the tech I had on the phone, the GPS SW version was more important then the Software version. It was in fact already updated to 3.00, I did master reset, after master reset, but regardless, nothing helped.

I contemplated what I should do.
Return mine and get a refurbished unit from Garmin for $225 with only a 90 day warrantee?
Buy a new Nuvi 660 for around $300
Buy a new Nuvi 2xx series with fewer features for $200 to $275.
Buy a Megellian GPS?

I read through this forum and came across one person that was told by Garmin “that they are aware of an issue with some Nuvis involving the failure of a diode in the unit that senses whether or not an external antenna is connected.” Apparently this diode failure is caused from the high heat these units experience from being left in a hot car for long periods of time. This would explain why mine would work in the beginning and then die.

So my thinking was, if the diode “thinks” there is an external antenna attached when it isn’t, what would happen if I “did” connect an external antenna?

Garmin recommends the Garmin GA 25MCX low profile remote GPS antenna for the Nuvi 660 and costs $31.49 (not sure about additional costs for tax and shipping)

So I purchased the NEW antenna from a seller on eBay for $25.90 total and IT WORK FLAWLESSLY.

Just to make sure it really was the new external antenna that was working and not the unit coming back to life, I started my 3 hour journey with the external antenna NOT connected. As usual it lost satellite reception in about 15 minutes. I plugged in the GA 25MCX and it immediately connected to the satellites and never lost them.

I repeated the same process coming home and once again, I connecting the external antenna after the unit reported loosing satellite reception, and it worked perfectly.

Conclusion: if your unit is experiencing loosing satellite reception, and is under warrantee, return it ASAP. If it’s out of warrantee, get an external antenna. There are other manufactures of external antennas and all should work as long as it has an MCX connector.

Side Note: This external antenna also worked perfectly on a friend’s Nuvi 350 with the same problem.

I wanted to share this with everyone because I’ve been racking my brain for months over this. I hope this helps.

May 04, 2008 | GPS

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