Luke, I decoded your file as is with: cat shipbulletin | dcuair -v 4 -d - -c 060202/0900 YYYYMMDDHH_shipuair.gem I specified "-c 060202/0900" as the time for dcuair since the report is for 8Z of the second day of the month (month and year are up to you to provide). The output from SNLIST on the decoded file looks like: SNFILE = 2006020209_shipuair.gem AREA = dset DATTIM = all SNPARM = dset STNDEX = LEVELS = all VCOORD = PRES OUTPUT = t MRGDAT = YES GEMPAK-SNLIST>r SNPARM = PRES;TEMP;DWPT;DRCT;SPED;HGHT STID = VLHJ08 STNM = -9999 TIME = 060202/0900 SLAT = -12.30 SLON = 129.80 SELV = -9999.0 STIM = 800 PRES TEMP DWPT DRCT SPED HGHT 1007.00 28.80 22.80 265.00 6.69 -9999.00 1000.00 27.80 21.80 260.00 6.69 68.00 975.00 25.79 20.99 280.00 7.72 290.78 925.00 21.60 19.30 285.00 8.75 754.00 921.00 21.20 19.20 284.15 8.87 791.74 857.00 17.25 15.16 270.00 10.81 1413.23 850.00 16.80 14.70 275.00 11.84 1484.00 827.00 15.33 13.96 285.00 13.38 1716.94 792.00 13.00 12.80 274.81 16.88 2084.14 785.00 15.00 10.40 272.72 17.60 2159.24 776.00 15.00 6.30 270.00 18.53 2256.97 etc. Some note sabout the decoded file: 1) The observed time is 8Z, however dcuair will bin these observations into 3 hourly time bins as is done for surface stations as well. 2) The created station ID is VLHJ08 which is the ship id plus the hour tacked on since the ship may take others as well in the next 3 hours. If this is not the output you are seeing or expecting then let me know. Check your GEMPAK version one more time if not 5.9.1. Steve Chiswell Unidata User Support Ticket Details =================== Ticket ID: QBS-614046 Department: Support GEMPAK Priority: Normal Status: Closed