Spectra Precision Survey Pro CE v3.6 User Manual - Manual (Page 117)

Screen Examples
111
4. Enter the latitude and longitude for your occupy point in the Lat.
and Long. fields, respectively.
Note: Your latitude and longitude should have enough accuracy if it
is scaled from a topographic map or measured using a handheld GPS
unit.
5. In the Aim field, select the area of the celestial body where you
plan to take your measurements. For sun shots, the trailing edge
is usually used. (The left edge when in the northern hemisphere.)
6. Tap the
&RUUHFWLRQV« button if the correction settings displayed
to the right of the button need to be changed.
• If performing a sun shot, check the
Non-Linear Declination
Correction checkbox. (Leave it unchecked for star shots.)
• Check the Correct to State Grid checkbox if you want the
computed azimuth corrected to align with the local state
plane coordinate system.
Note: The Central Meridian and Zone Constant values for the United
States are provided in Appendix A of the Reference Manual.
7. Refer to a current ephemeris and fill in the remaining five values.
When the screen is correctly filled in, tap the Shots tab.
Note: The GHA0 and Decl0 values are read from the ephemeris for
the current date. The GHA24 and Decl24 values are listed in the
ephemeris for the following day. The semi-diameter is in minutes
and seconds so your value will look something like
0.16084 .
8. Tap the
6KRRW button to open the Enter Shot Data screen.