COMMON MARINE FORMAT (IMMA RECORDS) Heading Codes Element Names Character Position DCK Source Identification 1-3 B10 ICOADS 10 Deg. Box No. 4-6 B1* Box Square (1 Deg.) 7-8 Lat* Latitude # 9-13 Lon* Longitude # 14-19 YR Year 20-23 MO Month 24-25 DA (DY) Day 26-27 HR Hour (GMT) 28-29 WD (D)* Wind Direction (tens of angular degrees) 30-32 WS (W)* Wind Speed (tenths of m/s) 33-35 V/I* Visibility Indicator 36 VV* Visibility (Code) 37-38 WW* Present Weather (Code) 39-40 W (W1)* Past Weather (Code) 41 SLP* Pressure (MSL) # 42-46 DB (AT)* Dry Bulb Temp (C) # 47-50 WB (WBT)* Wet Bulb Temp (C) # 51-54 DP/TM (DPT)* Dew Point Temp (C) # 55-58 SS/WW (SST)* Sea Surface Temp (C) # 59-62 ASD * Air-Sea Difference # (Computed) 4 spaces N Total Cloud (OKTAS) 63 N/H Total Amount Lower Clouds 64 C/L Low Cloud Type 65 I (HI) Cloud Height Indicator 66 H Height of Lower Clouds 67 C/M Middle Cloud Type 68 C/H * High Cloud Type 69 DW (WD)* Wave Direction (Sea) 70-71 PW (WP)* Wave Period (Sea) 72-73 HW (WH)* Wave Height (1/2 Meters) 74-75 DW (SW)* Wave Direction (Swell) 76-77 PW (SP)* Wave Period (Swell) 78-79 HW (SH)* Wave Height (1/2 Meters) 80-81 CC (C1)* Country Code 82-83 S/D (DS)* Ship Direction 84 S/S (VS)* Ship Speed 85 PTND (A/PPP)* Pressure Tendency / Change 86-89 Ice (IS/ES/RS)* Ice Accretion (Type, Thickness Rate) 90-93 Ship (ID) Ship, OSV, Buoy Call Sign /Number 94-102 * Blank space follows: Not counted in character positions. # Units in tenths: Decimals are not counted as character positions. Data set includes Voluntary Observing Ships (VOS) Climate (VOSClim) observations as well as observations from other ships and buoys in the ITOP region (10-40N and 110-150E) Data retrieved from the NCDC Marine Data Portal. The file naming convention is: yyyymm_sl-nl_wlo-elo.txt yyyymm is the year and month contained in the file sl is the southernmost latitude contained in the file nl is the northernmost latitude contained in the file wlo is the westernmost longitude contained in the file elo is the easternmost longitude contained in the file