Can you provide details on where to download the map and how to install?
The site provides basic instructions after selecting your year/make/model and starting your download. It is a large download, if you don't have fast internet, it may take you a bit.
General disclaimer: you do the following at your own risk. I am simply sharing what has worked for me and many others.
Do not extract the ZIP. You throw the ZIP file (it contains the maps) onto a USB flash drive that is a reliable unit (no throw-away cheapos, those can overheat or cause issues with the update). If you know what this means: it should be FAT32 formatted, but I believe Windows NTFS can also work. Otherwise, most USB drives are FAT32 out of the packaging, so you probably don't have to worry about that.
Start the truck, plug the drive into one of the USB ports in the truck. Your NAV will pop-up and ask you if you want to update. You say yes.
Make sure the truck is parked in a secure location (example: garage) and then walk away for 20-30 minutes, leaving it running. The maps are large, they take a while to update. Alternatively, you can sit in the truck (playing on your cell phone or whatever) for the 20-30 minutes, if you like. Just do not shut it off. Obvious disclaimer, if you do this in a contained space like a garage, leave the door partly or fully open, to make sure exhaust vents outside.
Some can get away with putting the truck into RUN (but not starting it) for the updating process, but the truck may timeout after a while to save the battery, and kill the upgrade. It is not recommended.
