Please help Obstructions above the horizon should not exceed what angle above the horizon? Choose the best answer.

$5^$

$25^$

$35^$

$15^$

How will performing careful office planning and field reconnaissance at the initiation of the project will save resources and make the field and office operation more efficient? Choose all that apply. Can determine travel time between stations that may be greater than anticipated due to road closures. Can avoid stations that are no longer suitable for satellite observations due to growth of nearby trees Can avoid stations that are no longer accessible because they are now behind a locked gate. Can avoid stations whose previous position was determined during an electrical storm.When developing a station occupation schedule, which of these factors can safely be ignored? Choose all that apply. Time required to properly fill out the log sheet Distance to HUB CORS Time to set up and take down the equipment Travel time between stationsSelect True or False for each of the following statements regarding antenna calibration. Click here for the list of Antenna calibration creates a map of phase advance and delay which depends on the answers satellite position relative to the antenna orientation. Click here for the list of Antenna calibration determines the appropriate number of satellites required to acquire an answers accurate station position. Click here for the list of Antenna calibration determines the point of reception of the Global Navigation Satellite answers System $($GNSS$)$ carrier phase signals. Click here for the list of Antenna calibration determines the minimum period of observation for an accurate position.Different types of antennas have different phase patterns. Click here for the list of answers Satellite elevation affects signal interpretation differently. Click here for the list of Choosing an incorrect antenna may result in a height error as large as $80$cm vertical, $1$cm horizontal. Click here for the list of It's okay to mix and match different antennas because antenna calibration models are not used by the processing software.