... GHRS has several operational modes for target acquisition and obtaining science data. ... Most targets observed with the GHRS can be automatically acquired with an onboard acquisition (ONBOARD ACQ). ... If you wish to confirm the spacecraft's pointing, we recommend obtaining an IMAGE after the acquisition instead of using the MAP option - see Chapter 4. ... There are several modes of science data acquisition, including Accumulation Mode, Rapid Readout Mode, and Image Mode. ... Image Mode . ...