Garmin Nuvi 780

Recognize the 780?

First read this:
http://www.poi-factory.com/node/32665

The 765t is able to do all that the 780 can and much, much more.

Both of my units are working with no problem, the 780 and 765t.

Use firmware 4.90 for the 780 and 4.0 if you upgrade to the 765t.

p.s
you can also listen to movies or standup comedy as well... rip dvd to mp3.

I keep about five on my unit at a time and reload more after I'm done.

I pulled this up on Garmin support.
What should I do if my Garmin nuvi or zumo displays the message No Detailed Maps Found That Support Routing" or "No Map Data Available?"

03/14/2011
The "No Detailed Maps Found That Support Routing" or "No Map Data Available" message may appear on your device for the following reasons:

The maps on the GPS device have been disabled
The GPS device is missing its unlock code
To determine the cause of the message, touch and hold your finger on the screen until the message "No Detailed Maps Found That Support Routing" disappears.

If you see a "Can't Unlock Maps" message following this error, remove any microSD / SD cards in the device and follow the instructions below for 'Retrieving Your Unlock Codes' followed by the instructions for 'Creating an Unlock File'
If you do not get the "Can't Unlock Maps" message then skip to the instructions for 'Enabling Maps on the GPS Device'
Retrieving Your Unlock Codes:

Log into your myGarmin account at http://my.garmin.com .
Click on the myMaps tab.
Click on the Details link next to your device.
Locate the most current unlock code for your device underneath the Installed Maps heading.
Creating an Unlock Code File for PC:

Connect your Garmin device to your computer with a data transfer USB cable.
Double-Click on My Computer or Computer located on the Desktop or in your Start Menu.
Right-Click on the Garmin drive.
Click Explore.
Double-Click on the Garmin folder.
Right-Click in a blank space in this window.
Move your mouse over the word New.
Select Text Document.
Press Enter / Return on your keyboard.
Double-Click on the New Text Document. This will open the New Text Document in a window called Notepad.
Type the unlock code that is listed in the Manage Maps section of your myGarmin account in all capital letters with no spaces or symbols.
Select File.
Select Save As.
Change the Save As Type to All Files.
Type gmapprom.unl in all lower-case letters for the File Name.
Select Save.
Close the Notepad window.
Delete the file named New Text Document.
Disconnect the GPS device from your computer.
Creating an Unlock Code File for Mac:

Connect your Garmin device to your computer with a data transfer USB cable.
Open the TextEdit application located in the Applications folder.
Click Format.
Select Make Plain Text
Type in the unlock code that you retrieved from your mygarmin account. The unlock code should be in all capital letters with no spaces or symbols.
Click Save As and name the file: gmapprom.unl
Uncheck the box "If no extension is provided, use '.txt'.
Save the file to your Desktop.
Double-Click on the Garmin device icon that is mounted on the Desktop.
Double-Click on the Garmin folder.
Copy the gmapprom.unl file from the Desktop to the Garmin folder on your device.
*nuvi units that are preloaded with transatlantic (North America and Europe) mapping will need to follow the Creating an Unlock Code File instructions above for their North America mapping and then create another unlock file for their European maps. The European unlock code file should be named gmapprom1.unl

Enabling maps on the GPS device:

Touch the Tools and/or wrench icon on the Where to/View map screen
Touch Settings
Touch Map or MyMaps
Touch Map Info (*Note: Some nuvis do not require this step.)
Select the checkbox next to the maps to be enabled on the device

@gw007msn: A few questions so we can better help?

Did the map update complete successfully? Which map were you updating to?

Were you also doing a map update on the eBay unit, or did it just quit?

Do any of the 5 sample audio books work? Can the unit play MP3s?