Spectra Precision Survey Pro v3.80 Recon iPAQ User Manual User Manual

Page 143

Screen Examples

135

•

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.

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

Tap the

6KRRW button to open the Enter Shot Data

screen.

Enter the correct hours to GMT in the

Hrs To GMT

field, aim toward the backsight and tap

7DNH 6KRW to

record the horizontal angle to the backsight. (The
true azimuth to this point will be computed at the
end of the routine.)

Note: The hours to GMT will be between -5 and -8 when
in the continental United States.