i, too, uploaded a hacked version of v26 for others to download.
as of right now, 1 person is testing it. once, they let me know
it's working, i'll post the link. the version i created has 2 views -
Perspective and Travel Direction. it also is using this splash screen.

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Has anyone noticed that while the Roundel pictured below looks great on the monitor, when you load it into the car, it looks a bit oblong (kind of squashed really)?

Depends it should be OK on a 16:9 Screen but will look a bit Oblong on a 4:3 screen

Hmmm I drive a BMW 330i. IS my screen 4:3 or 16:9?

Hi, I believe you will need to address two issues if its anything like the embedded software I have been involved with in the past.

1. If the gif is a different size than the original you will probably get errors as the linked image probably requires different modules all at previously assigned places - set at image link time. I think you would need to make the image identical size to get around this with the same byte alignment also.

2. There is no doubt a checksum across the whole image to ensure the Nav hardware doesn't start running corrupt s/w and therefore die in a nasty way. This I dont think you can get around other than to work out how the checksum is done. Presumably on the other thread where some mods were done this has been solved (?)

Good luck !

cheers,
Seedar.

Hi Seedar,

This has been covered already. When people first started replacing GIF images, I had exactly the same thoughts.. that there had to be a checksum, and indeed there is.

The "navboot" file, which is the one being modified is developed for an operating system called OS9000, and the "navboot" file is made up of modules, some of which are images, some of which are files.. In OS9000 these are all lumped together in one large file.

Each module had a header, module length, type, name, and finally at the end of the module a 24-bit checksum.

Eariler in these posts you'll find a GIFExtracter and replacer. This program locates the image modules in the "navboot" file. When using this program you'll notice that the main image module is 133Kb in size, even though the image stored in the module is only 4Kb in size. The GIF in this module can be replaced by one up to that size, using the program, and the checksum is recalculated, ensuring that the sat nav computer correctly loads the software..

So you're completely correct, but it's all been done already..

NavMan

i would assume u can define it as gifs that cause the
type of reaction that you got when attempting to
replace the gif.

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2Wires - i recently downloaded the new version of GIF Extractor, but
when i attmepted to extract the navboot file, i get this error -

"An unhandled exception has occurred in your application. If you click
Continue, the application will ignore this error and attempt to continue.
If you click Quit, the application will shut down immediately.

This device is not ready."

Details -

"See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.IO.IOException: The device is not ready.

at System.IO.__Error.WinIOError(Int32 errorCode, String str)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean useAsync, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode)
at GifExtractor.Form1.cmdStart_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventAr gs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.2032
CodeBase: file:///c:/windows/microsoft.net/framework/v1.1.4322/mscorlib.dll
----------------------------------------
GifExtractor
Assembly Version: 1.0.2245.5857
Win32 Version: 1.0.2245.5857
CodeBase: file:///C:/Program%20Files/GIF%20Extractor/GifExtractor.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.2032
CodeBase: file:///c:/windows/assembly/gac/system.windows.forms/1.0.5000.0__b77a5c561934e089/system.windows.forms.dll
----------------------------------------
System
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.2032
CodeBase: file:///c:/windows/assembly/gac/system/1.0.5000.0__b77a5c561934e089/system.dll
----------------------------------------
System.Drawing
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.2032
CodeBase: file:///c:/windows/assembly/gac/system.drawing/1.0.5000.0__b03f5f7f11d50a3a/system.drawing.dll
----------------------------------------

************** JIT Debugging **************
To enable just in time (JIT) debugging, the config file for this
application or machine (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the machine
rather than being handled by this dialog."

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I had exactly the same problem on my Thinkpad lappy that I do the burning etc on. However I loaded it on my Server PC and it worked OK.

I wonder if it's the version of .net or something? I had it already loaded on the Thinkpad but had to load it on my server PC.

Don't know enough about this stuff to work out what the error means.