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It is possible to obtain the 4-digit unlock code of the navigation?
Yes, go to this website: Honda Radio / Navigation Code Retrieval and Reset Instructions

To get the code: "You can get the Serial# from the navi unit screen, what you have to do is to press MAP + MENU+ CANCEL for about 15 seconds, then the diagnostics screen will appear, there you have to go to the UNIT CHECK option and then select the option related to the ECU, there you will find your serial #. The problem I have is that my serial gives me a code that does not unlock my navi... "

source: Navi system unlock code?

Another way is:
"Dont know if anyone knows yet but all you need to do is pull that little panel thing off with a flat head screwdriver.....its that 4in X 6in piece that prys off up by the storage tray in front of the shifter.....then you gotta look up toward the unit and you'll see a barcode wit i think 11 characters. I couldnt see the full serial by eye so i put my phone in there and took a picture....called Honda , talked to a service advisor, gave him the serial, he gave me the code.....So.....you dont have to take off the 3 or 4 panels to look at the "BACK" of the unit.........."

source: Navi system unlock code?
 

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I just wanted to chime in and share my experience with unlocking the navigation code for my Honda. I was able to obtain my code by going to the Honda Radio / Navigation Code Retrieval and Reset Instructions website, but I know that some people have had issues with the code not working.
Another option that has worked for some is to remove the panel above the storage tray by the shifter and take a picture of the barcode with their phone. They then called Honda, provided the serial number, and were given the code. Try for that Smart Engines OCR SDK. It's a tool for extracting information from barcodes and other types of images, which can be helpful.
 
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