Table 2.
Statistics by vessel for instrument-hour averages (ppm), hourly GSDs, and hourly averages (ppm). The median, minimum (min), and maximum (max) are provided for each type of statistic. The minimum instrument-hour average was consistently 0.05 ppm and is therefore not shown.
| Vessel type | Vessel name | Instrument-Hour Averages | Hourly GSD | Hourly Averages | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | Daily Averages | Daily Averages | Overall | |||||||||
| Median | Max | Median | Min | Max | Median | Min | Max | Median | Min | Max | ||
| ROV Vessels | Boa Deep C | 0.05 | 515.57 | 0.39 | 0.05 | 26.30 | 1.50 | 1.08 | 8.17 | 0.35 | 0.05 | 163.20 |
| Boa Sub C | 0.05 | 3261.41 | 0.24 | 0.05 | 83.37 | 2.31 | 1.09 | 8.84 | 0.09 | 0.05 | 1269.47 | |
| Casey Chouest | 0.05 | 14.55 | 0.18 | 0.05 | 1.13 | 2.71 | 1.55 | 5.36 | 0.17 | 0.05 | 5.48 | |
| Chouest Holiday | 0.05 | 10.58 | 0.13 | 0.05 | 0.81 | 7.14 | 2.58 | 9.61 | 0.05 | 0.05 | 4.33 | |
| Helix Express | 0.05 | 76.75 | 0.11 | 0.05 | 4.10 | 2.54 | 1.09 | 7.01 | 0.05 | 0.05 | 35.12 | |
| HOS Achiever | 0.05 | 178.11 | 0.25 | 0.05 | 3.99 | 2.82 | 1.20 | 10.03 | 0.12 | 0.05 | 64.61 | |
| Iron Horse | 0.05 | 44.30 | 0.61 | 0.11 | 6.39 | 1.67 | 1.15 | 3.50 | 0.44 | 0.06 | 26.05 | |
| Normand Fortress | 0.05 | 36.92 | 0.05 | 0.05 | 1.38 | 3.14 | 1.12 | 3.63 | 0.05 | 0.05 | 11.45 | |
| Ocean Intervention I | 0.05 | 2.76 | 0.05 | 0.05 | 0.81 | 1.59 | 1.16 | 6.11 | 0.05 | 0.05 | 1.03 | |
| Ocean Intervention III | 0.05 | 5497.71 | 0.48 | 0.05 | 110.48 | 3.18 | 1.45 | 8.08 | 0.26 | 0.05 | 1104.76 | |
| Olympic Challenger | 0.05 | 90.00 | 0.14 | 0.05 | 1.42 | 3.41 | 1.27 | 10.60 | 0.06 | 0.05 | 18.10 | |
| REM Forza | 0.05 | 1118.21 | 1.04 | 0.05 | 14.67 | 2.53 | 1.22 | 7.00 | 0.28 | 0.05 | 244.56 | |
| Skandi Neptune | 0.10 | 1242.96 | 1.17 | 0.05 | 34.37 | 1.72 | 1.21 | 8.87 | 0.99 | 0.05 | 448.02 | |
| MVs | Adriatic | 0.05 | 1.96 | 0.05 | 0.05 | 0.27 | 1.73 | 1.46 | 4.83 | 0.05 | 0.05 | 1.83 |
| Blue Dolphin | 0.05 | 44.07 | 0.26 | 0.06 | 6.07 | 2.69 | 1.08 | 6.72 | 0.17 | 0.05 | 9.41 | |
| Helix Producer | 0.05 | 18.33 | 0.38 | 0.05 | 3.57 | 1.59 | 1.14 | 3.78 | 0.25 | 0.05 | 11.38 | |
| Loch Rannoch | 0.05 | 92.22 | 0.21 | 0.05 | 11.36 | 1.92 | 1.11 | 11.19 | 0.08 | 0.05 | 46.47 | |
| Massachusetts | 0.05 | 91.11 | 0.29 | 0.05 | 19.38 | 3.17 | 1.37 | 10.87 | 0.10 | 0.05 | 48.76 | |
| Monica Ann | 0.05 | 67.31 | 0.30 | 0.07 | 5.81 | 1.92 | 1.26 | 8.15 | 0.16 | 0.05 | 23.72 | |
| Normand Commander | 0.05 | 150.29 | 0.18 | 0.05 | 4.47 | 1.98 | 1.16 | 10.47 | 0.13 | 0.05 | 32.22 | |
| Odyssea Diamond | 0.05 | 70.32 | 0.36 | 0.06 | 3.38 | 2.42 | 1.37 | 9.10 | 0.21 | 0.05 | 30.68 | |
| Overseas Cascade | 0.05 | 298.52 | 0.25 | 0.05 | 6.64 | 2.38 | 1.21 | 11.50 | 0.13 | 0.05 | 58.81 | |
| Seacor Pride | 0.05 | 2.39 | 0.19 | 0.08 | 0.47 | 4.56 | 2.21 | 5.88 | 0.09 | 0.05 | 0.99 | |
| Seacor Reliant | 0.05 | 14.11 | 0.53 | 0.05 | 1.02 | 1.45 | 1.45 | 1.45 | 0.33 | 0.05 | 3.57 | |
| Seacor Vanguard | 0.29 | 7.78 | 0.61 | 0.15 | 1.58 | 1.58 | 1.34 | 2.17 | 0.64 | 0.05 | 3.83 | |
| Seacor Venture | 0.05 | 7.01 | 0.28 | 0.05 | 2.04 | 8.90 | 1.25 | 10.83 | 0.05 | 0.05 | 7.01 | |
| Stim Star III | 0.05 | 36.97 | 0.53 | 0.09 | 1.96 | 3.83 | 1.53 | 10.78 | 0.14 | 0.05 | 6.26 | |
| Strongline | 0.05 | 1.29 | 0.05 | 0.05 | 0.46 | 3.63 | 2.38 | 4.88 | 0.05 | 0.05 | 0.46 | |
| Tyler Stephen | 0.05 | 69.48 | 0.24 | 0.05 | 4.20 | 4.44 | 1.20 | 11.27 | 0.13 | 0.05 | 15.27 | |
| War Admiral | 0.05 | 7.27 | 0.52 | 0.28 | 1.96 | 2.20 | 1.07 | 2.73 | 0.34 | 0.05 | 3.11 | |
Instrument-Hour Averages Overall: statistics using all instrument-hour averages (weighted equally); Instrument-Hour Daily Averages: the daily instrument-hour average was calculated and statistics were performed on the daily average instrument-hour averages; Hourly GSD Daily Averages: the hourly GSDs were averaged within a day and statistics were performed on the daily average hourly GSDs; Hourly Average Overall: we took the statistics of all hourly averages (weighted equally).