My Gps Raymarine Dosent Read the Cart
*** Frugal Yankee Alert ***
I thought I'd document what I found, in case anyone else goes through this as many people on the lake may have some of this older equipment.
I have a 2005 boat that has Raymarine C80 MFD and a RS-120 GPS sensor on it. Mine are probably 2004 vintage considering the build date of my boat.
Merely ii weeks agone I had a problem where I could not get my MFD to brandish my position. When looking at the GPS Status page, information technology displayed 'NOFIX', which ways that the GPS can't lock onto enough satellites to become a good location fix. Thinking that I had a GPS failure, or a wiring failure, or all sorts of things, I was thinking this was going to cost me a lot of money (after all, this is a B.O.A.T.).
Afterwards trying to reset the power to the GPS, the MFD, and other things, I was near to surrender, only then I tried the 'RESTART GPS' button that is on the GPS Status page. This worked! But every fourth dimension I restarted my MFD, I would end up with the same trouble again.
I checked online and read many posts, likewise as reviewing my documentation and the Raymarine web site. My GPS is a RS-120. It seems this unit of measurement contains a lithium bombardment that has a projected life of 10 years. Yes, information technology'southward been just about xi years for mine, and then if we judge that it was manufactured in 2004, Raymarine's 10 year life prediction is about right! 
The bombardment is used to maintain the internal clock on the GPS when the power is off, besides as to maintain information about the locations of the satellites. Without the ability to think this data, information technology takes too much fourth dimension for the GPS to find from scratch the satellites (cold start). The battery allows it to do more of a 'warm kickoff' and have an idea on where to start looking.
Raymarine's solution to this failed bombardment issue on the RS120 is to supersede the GPS, equally they don't service the RS-120 anymore. The new GPS's are probably more accurate, quicker, etc. but I'd rather non pay $300 plus if I can go my GPS working again, considering if I need to replace the GPS, I'd rather put the money into newer engineering such every bit a new MFD which includes many more features and greater accuracy.
And then I decided to take a chance and disassemble my RS-120 GPS to have a expect (it's a habit that I've had since I was virtually 5 years old, and I can't boot this habit now). Sure enough, inside the RS-120 was a 3V CR-2032 button lithium battery manufactured by Varta. Yes, this is a very mutual coin blazon battery used in many devices! The trouble is that information technology was soldered in place past tabs that are welded onto the button bombardment itself. I'1000 sure Raymarine soldered information technology in place to be certain that corrosion wouldn't affect a battery socket over the life of the GPS. This complicates changing the battery a bit.
Here are the pictures with some instructions if anyone else wants to attempt to replace the battery in their Raymarine RS-120 GPS. © Rich 2015 ! 
Note: This is merely a solution for a failed battery. If your GPS volition work OK later issuing the 'Restart GPS' control from your GPS Status screen, and your GPS is nigh 10 years or more one-time, then this procedure may get the GPS working once more as it was before the internal bombardment went expressionless.
It was easy to detach the RS-120. First there were two screws holding the mount to the bottom of the GPS sensor. Then there were 6 small-scale screws that had to be removed. After the 6 screws are removed (don't lose them!), pull the acme off, just be conscientious not to damage the gasket under the excursion board. There is also a large O-ring used to seal the case, simply this i doesn't look easily damaged.
Here is the original bombardment as installed by Raymarine, information technology was a Varta 2032 3V Lithium button battery. In this picture the positive terminal of the battery is facing down or away from the circuit lath, the negative last is facing 'upwards' or towards the GPS circuit board:
Original Varta 2032 3V lithium battery can be seen under the circuit board
I checked the voltage on the original bombardment and it was downward to virtually 0.iii VDC. This should be at iii.0 VDC or higher.
I went to a local Batteries+ (or may be known as Batteries+Bulbs). They built me a new battery 'pack' using a CR2032 Lithium battery. Basically they spot welded two wires onto a CR2032 bombardment for me, and then covered the bombardment in estrus shrink tubing to insulate it. It cost me $14.99. A bit pricey, but information technology was congenital while I waited and at to the lowest degree I know it was built properly, and also has a fresh battery. Note that if you lot try to solder wires or tabs to the CR2032 battery yourself, you lot will probably over rut and harm the battery. It's best to purchase i that already has solder tabs on it (or become one congenital for y'all equally I did). Alternatively, you could install a CR2032 battery socket, but and so you could accept bug with corrosion over time.
To remove the old battery from the GPS, first confirm that there is no ability to the GPS by checking at the reddish and black leads that come to the circuit board with a volt meter. If there is 12V power hither, discover the billow for your MFD or electronic accessories to turn off the power and confirm that it is off before proceeding.
I and then used some scissors (or you can use wire snips) to clip the battery tabs, but go out enough of the tabs on the circuit board to allow you to solder the new battery wires. Don't flex these tabs also much, or cutting too shut to the excursion board, you don't desire to stress the circuit board traces likewise much and they could exist fragile, so be careful. This mode y'all're not taking the chance to damage the circuit board when trying to solder the new battery wires.
Raymarine RS-120 GPS with its original battery clipped out. Take note of the positive (to the left) and negative (to the right) terminals earlier you remove the original battery.
Side by side place the new battery (be sure information technology'south fully insulated) into the base of operations of the GPS, then route its wires to the tabs and solder them to the tabs taking of import annotation to see that the positive and negative leads are installed properly.
Raymarine RS-120 GPS with the new battery installed. Y'all can run across the new battery insulated and installed to the left of the cable clench. Its wires are soldered to the clipped tabs of the original battery (blood-red is positive, black negative).
So check the voltage at the old bombardment tabs after installing the bombardment. The one that is to the left in the photo (closer to the heart of the circuit board) should exist positive, and the 1 closer to the edge of the circuit board is negative. You should read about 3.two VDC hither with a fresh bombardment after it is installed. If the voltage is correct, you are done, re-assemble and re-install the GPS.
Restore the power to your GPS. Turn on your MFD. You may need to apply the GPS Status page to effect a 'Restart GPS' control. Once this is done, information technology may accept a couple of minutes to fully lock onto the satellites. One time this occurs, y'all should get quick lock-ons in the hereafter.
I simply saved you lot almost $375 USD as Raymarine wants you lot to purchase a new GPS and SeaTalkng converter kit to retrofit a new GPS into the older MFD systems that used RS120s:
http://www.amazon.com/Raymarine-Rays...aymarine+rs130
Y'all're welcome! If you're happy with this procedure, feel free to send me a donation! © Rich 2015
Of import WARNING: If you're non comfortable with working with electronics, go someone that is to help you! Equally you could easily damage your GPS for many reasons, and and so it WILL price you $375 (plus installation) to supervene upon your damaged GPS.
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Don't mind to me, obviously I don't understand what I'm talking almost!
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Source: https://www.winnipesaukee.com/forums/showthread.php?t=19281
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