Near Intersection of I-35 & I-90 Southern Mn. | When you say they don't work - do you mean that you are not receiving GPS or not receiving corrected GPS. Is your power source very reliable?
I am assuming that you are using WAAS as the correction source.
If you are receiving GPS and not differential it is possible that you are not receiving the WAAS correction signal because your unit may be attempting to use PRN 122. PRN 122 was commonly used in the Midwest a couple of years ago but has been moved. It is still usable at times but not at others due to the distance. Not knowing your location, this may or may not have anything to do with your problem.
What device are you using the GPS with? If the device is a Raven lightbar for example, you can check some of this information via the lightbar. Otherwise you may need a laptop with the proper software to check your setup.
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Phoenix 200
