Download the update files below. Change them to *.exe file (some Windows does not allow to upload/ download .exe file, so we re-named to .txt file)
Then replace (i.e., overwrite) the files into: C:\Programdata\GPC\
April 25, 2026:
N_GAPA Suite Update: GPC N_GAPA Suite.txt
A bug was found when the accelerometers were mounted up-side-down (i.e., inverted), the program adjusted the displacement record correctly (to the inspector's LP record, if "BC Match Level" > 0 was used ) correctly, but did not display it the displacement curve correctly. Update fixes this bug. Some other cosmetic updates (such as default file names when PDF file out).
GPC Acquisition: GPC.txt (only needed for Field Laptop)
When driving in pinnacle rock condition (i.e., sloping rock), the concrete pile toe can walk away along the sloping rock, causing micro-cracks (typically within bottom 1/3 of the pile). WC would be slower (i.e., pile looks like it's longer). Then when real damage happens, an early reflection (prior to the toe) will show up. In this situation, uncheck the "Leave WC constant" (in ADVANCE tab) will help detect the variable WC as pile driving goes, which gives better pile integrity evaluation. Default is to "Leave WC constant" in most other situation (because "longer" pile could be due to soil plugs, or due to very soft gradual rise in some weird diesel hammer. The update has better algorithm for variable WC.
March 7, 2026: (update into C:\Programdata\GPC\Data\ only if your dll file time stamp is older than March 7, 2026):
N_GAPA engine: DPT_Stage2.dll
MQ penalty was added when signal matching resistance (WU curve) is over-estimated (compared to Measured WU). This added MQ penalty helps the iN_GAPA focus on solutions that do not over-estimate the resistances (kind of reward if not over-estimate!).