There is no map, as the programming content versus the actual frequency is dynamic, and may not be sent out on the same frequency twice.
To find out what frequency you are on, you need to power off the STB, and press the MENU or SELECT button on the front of the STB, which will bring up the STB's internal menu. There should be a menu item that says something like 'Tuned fequency'. Use the arrow keys on the front of the box to select it; this will display the broadcast channel and the frequency.
Hope this helps.
Written by Joseph Queen - John L
Last updated on 11.15.07