I've been messing around with the code and the position is just fine, but the problem is getting a marker up which is really important.
If you use this widget http://www.adobe.com/cfusion/exchange/index.cfm?event=extensionDetail& extid=2187524 you will be see exactly where to add the marker.
Gramps
On the left side of the Confiigure screen Click Marker
Show marker - Ensure you click this - a tick appears in box
Enter Latitude & Longtitude of marker
Tooltip: Enter the caption you want to appear when you hover on marker
Marker Leave as default for the standard Red/Orange marker or you can enter a URL for another marker styling
North America
Europe, Middle East and Africa
Asia Pacific