Yes and no, you don't need to select the transponder manually (assuming you're subscribed to the DISH network). The DISH receiver will automatically select the satellite/transponder combination to give you the best available picture quality for the channel you're viewing.
The diagnostic screen that you're viewing is best used to help you locate the X2 around your campsite so that you get the best satellite signal strength at your current location (avoiding obstructions and tree cover).
When traveling, the eastern arch satellites (61.5 and 72) provide the best signal strength in the eastern states and the western arch satellites (110, 119, and 129) are best in the western states.
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