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I don't have the XT anymore. I reviewed it and them sent it on. I did go under some heavy trees until it lost signal in ST mode and then put it in XT and it got a fix. I also tested it inside some buildings where I was never able to get a fix with "standard" gps units and it did get a fix there as well. The XT is amazing at how it can use really poor signals to get a fix and in the right circumstances would be really good. Even driving the XT mode is better than nothing, but you have to be aware of, and live with, the delay in displaying position. If I were a trucker who went to urban canyon addresses in heavy traffic and wanted to have some mapping, the XT mode would work to get me on the right block. The 10 second delay may mean I pass the actual address before it tells me I am there, but as long as I remember that I can be looking for my destination in advance and be confindent I am at least in the right neighborhood.
On moving highways where you are travelling at higher speeds, 10 seconds behind could mean as much as 700-800 feet, but generally on those highways you have a clearer view of the sky and don't need XT, just the ST mode. For driving out of or into an urban canyon, however, the problem is swapping requires removal of the unit, movement of a switch and then a cold restart. All of that is not safe to do while driving so you would either have to stop or have a passenger do that for you.
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