said by grohgreg:
This brings me to a question about the pointing angles predicted by the modem. Is the Azimuth predicated on true north? or magnetic north? As you can see from the attached map, the difference between magnetic and true in this country can be over 20 degrees. I say this because - if you use a compass - you might need to consider magnetic deviation. If you use an app on a smart phone - it might be a good idea to check the settings, to see if it's displaying magnetic or true.
The modem shows magnetic. I say that with some degree of certainty after many comparisons in different locations. In my earlier post in this thread I was careful to note that I was giving the magnetic values. From Cincinnati both values are (rounded to nearest degree):
Spaceway3: 196 True, 202 Magnetic
ES17: 213 True, 219 Magnetic
Either way I cannot imagine a shot from SW Ohio at 202-203 true or magnetic being ES17, if the value was being correctly displayed.
There are localized variations in this country that can make a compass get downright squirrely.--
Motosat self-pointing dishes: .74 meter G74 on 127W, SL-5 HD DirecTV|Hughes HN7000S|Verizon UMW190 Air Card|1990 Blue Bird Wanderlodge Bus "Blue Thunder"|Author of hnFAP-Alert, PC-OPI and DSSatTool