[last updated 03/14/2008]
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One option
you have on the TomTom ONE is to create your own Point Of Interest
(POI) inside of
a POI Category. An example of a POI Category is
"Restaurants" and an example of a POI
is a specific McDonalds on your map, dictated by its lattitude and
longitude.
I won't get into the details of how to create a POI or a POI
Category on your
TomTom because the owner's manual does a decent job of that.
A copy of the owner's manual can be found below:
>>>
TomTom Owner's Manual <<<
Now, once
you've created some of
your own POI Categories, you are given a very limited set of icons
to use for each of your
POI Categories that you create. Here are a few
examples of what you have to choose from:

It is important to note that any POI that is individually created
within a POI category
will use the icon that is designated for the POI Category that it is
created under.
For example, if you create a "Friendlys" POI Category and assign
a
to it, then whenever you
create a new POI under the "Friendlys" category, a
will be shown on your map for these POIs.
Now the built in icons are not very creative. In reality, you
would want something a little
more snazzy as an icon for Friendlys...like the Friendlys sign, for
example.
You can find instructions on how to change your category icon below:
1. Follow your
owner's manual instructions for creating a POI Category.
2. The Category you created in step #1 shows up as two files
on your TomTom:
a) The *.ov2
file is the actual POI Category file (for example: Friendlys.ov2)
b) The *.bmp
file is the icon attached to the POI Category (for example:
Friendlys.bmp)
c)
The *_X2.bmp file is the
icon for the recently visited locations (for example:
Friendlys_X2.bmp)
NOTE:
These files are found
in the specific map folder in which you are using at the time of the
POI creation.
In my
example, I am using the USA
and Canada maps. Therefore, my *.ov2 and *.bmp file are
located
here:
/TomTom
(K:)/USA_and_Canada/Friendlys.ov2
/TomTom
(K:)/USA_and_Canada/Friendlys.bmp
/TomTom
(K:)/USA_and_Candada/Friendlys_X2.bmp
3. Find an icon that you are interested in using for your POI
Category. I found the following icon on the web: 
4. Using your
favorite image editing software, resize and save the POI image using
the
following specifications:
a) 24
x24 pixels
b)
Windows bitmap (*.bmp)
c)
Filename = <POI Category>.bmp (note: the TomTom
is case sensitive,
so insure the POI category name is
exactly the
same as the category name: For example: Friendlys.bmp)
NOTE: You can also create a larger custom
image which
will be visible in, for example, lists of recently
travelled locations in
your TomTom menu (this is the file with the _X2.bmp extension above)
5. Plug in
your TomTom to your PC
6.
Turn on
your TomTom
7. Using
Windows Explorer, find your TomTom device (it will have the little red
TomTom icon next to it:
)
8. Click the
little "+" sign next to the TomTom icon to expand the folders:

9. Copy the *.bmp
file from step #4 into the map folder in which you created the POI.
- In my
example, it is the USA_and_Canada folder
10. On your
windows lower right icon task menu, click on the safely remove hardware
icon: 
11. When
Windows states it is safe to remove your hardware, disconnect your
TomTom from your PC.
12.
Now
whenever you see a POI for your custom category, you will see the new
icon you created:
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