iGage iG9 User Manual
69
Power Poles
< 500 KV DC Transmission Lines and Tower
This class-1 elevation bench mark with measured gravity is unfortunately in a location that is no
longer suitable for GPS observations. It was set prior to the construction of the powerline. This is a
BAD
location.
You should avoid locations that are under high voltage transmission lines and have large steel
towers directly to the south.
Smaller power poles and lines are also unacceptable, especially if they are south of the occupation
site:
#9 Optimizing Occupations in the Real-World
Receiver Placement
In North America, the most important sky is to the East, South and West (because there are never
any GPS satellites directly north.) So, if you are setting up in a field that is surrounded by large trees,
