Navman f20 Assert failure on screen - with Reloading maps, please wait, For optimum performance, select less than 25 maps. Screen is locked on and I cannot turn off the Navman at all............cheers and thanks, Ian

any store that sells Navman GPS should be able to accept the repair. It wont be cheap though


Please rate my help++++Thankis for using FIXYA

The F20 Desktop Software and Service pack on the CD's from navman do not work, as you have seen. The solution is to go to the navman website and download this Service Pack

Be sure your f20 is connected to the USB cable and turned on displaying the USB Connection screen. Leave it on during the entire process.

Once downloaded, run this self extracting file and let it install automatically. After it is installed and ran.....you will see the same error again of failure to connect.

At this point you must reinstall the driver manually. Right click on your "My Computer icon, Select Devices, then properties on the navman. You should see a yellow "?" next to a statement "Unknown Device" in the USB devices. Click on the "Reinstall Driver" and select a specific location or the Have Disk button. The USB driver is now located in C:\program files\Navman\f20servicepack\USB directory.

You should get a button that now says Okay at the bottom, click onto it and allow the MS program to update the drivers. You should see the device screen change and say "This device is operating properly". You can then close the windows and run the F20 desktop program. It should connect then.

you'll need a mandatory firmware update

click here

You should be able to install your old map from the DVD/CD that originally came with your Navman - you don't need a Product Key for this, even if it prompts you for one.

It appears that the commercially available 2009 map for the S-Series does *not* cover the S30 3D, just the non-3D versions, although that's not at all obvious from what's on Navman's web-site, so you have my sympathies if you bought it expecting it to work...

Unfortunately, the maps for this device are not free. If he didn't send you the USA map you will probably have to buy it on SD card from their website. Sorry I couldn't be more help.

why won't my computer find my navman f20 i brought a connectivity kit as they told me that would fix it but it still will not find it

I have a navman f20 sd card with US maps would be glad to make you a copy of it. [email protected]

I have a F20 here I am currently tring to fix.

The error comes from the internal memory card being faulty.
It is only a micro SD car.

It may be totally usesless, or need re-programming via the USB port.

You can download the firmware, and it fixes a working MicroSD card.

If your card is damaged, then you will have to replace it, and strip the F20 down to do so.
Then you can upload the firmware.

I warn you, though.
Stripping it down is a bit tricky.
I replaced this F20 memory card, and put on the firmware, but have a new error, that it cant find any maps installed.

Hope this helped you
Michael
[email protected]

When I turn my unit on all I can see is the accept/decline screen. The unit will not load the maps. How can I fix this?

Step 1
Connect your Navman Device to your computer via a USB cable.
Turn on your device and you will see a connection screen appear.

Step 2
Wait a few Seconds until a window appears on your desktop and then select “open folder to view” by double clicking on it

Step 3
Once you have opened this folder you will need to double click on “My Documents”


Step 4
Once my documents is opened locate and files that starts with “LOG00” and also “My Mileage” and delete them


Step 5
Once the above steps are done you may disconnected your unit from the computer.
Turn your unit on and enter your main menu page 2/2 and select “Preferences” then select “Route Options”

Once this is selected go to page 4/4 and un-tick “Enable GPS data logging” and “Enable trip recording”


Your unit is ready to use and will run a lot smoother due to increasing unwanted data and freeing space to increase optimum performance. We suggest that you follow these steps once a month to ensure optimal performance.

These steps will work on the S50, S80 or S90i. If you are experiencing this issue on an S30 or any other device, please contact Navman Technical Support on 1300 628 626.

I used this personally on my S80 after it died during my work as a Security Patrol officer and I was not happy, its all fixed now and I have my Nokia N95 loaded with the same places just in case.

Navman is awful on support for map updates, which they claim are the latest. I've had mine less than a year and have decided to sell it and replace it with a Garmin. You can get maps that are 1-3 years old, even though Navman says 10 months old, for $149 USD. Horrible Company, it should be struck by lightning and let it burn to the ground!