Annex 5 245 uncertainties (standard deviation of approximately 13% of mean) being for well observed (on AIS) fleets, and those fleets where the total number of ships listed in IHSF closely matches the number of ships observed on AIS (cruise ships, large vehicle carriers, large tankers and bulk carriers and large container ships). This contrasts with the smallest size general cargo fleet and the smallest tankers (both 0–5,000 dwt), which have standard deviations exceeding 20% of the mean estimate. The contrast is even more notable for certain categories of non-merchant shipping (e.g. “Miscellaneous – fishing” and “Miscellaneous – other”: 37% and 56% respectively), which are poorly observed and poorly matched in IHSF, although in both cases these are ship types and sizes which are not categorized in this study as international shipping. Table 21 – Estimated characteristics of the uncertainty for individual ship type and size categories Ship type Size category Mean Standard Deviation Standard deviation as a % of mean Bulk carrier 0–9,999 4,484,703 783,207 17% 10,000–34,999 23,406,255 3,572,119 15% 35,000–59,999 43,016,318 6,617,266 15% 60,000-99,999 44,617,850 6,411,213 14% 100,000–199,999 35,363,715 5,188,630 15% 200,000–+ 10,478,638 1,494,526 14% Chemical tanker 0–4,999 4,493,655 679,510 15% 5,000–9,999 7,007,269 956,839 14% 10,000–19,999 12,117,662 1,744,680 14% 20,000–+ 29,614,933 4,314,846 15% Container 0–999 12,289,773 1,599,989 13% 1,000–1,999 30,532,084 3,913,000 13% 2,000–2,999 24,649,848 3,352,376 14% 3,000–4,999 52,578,459 6,509,096 12% 5,000–7,999 42,436,722 5,480,776 13% 8,000–11,999 30,009,753 3,925,368 13% 12,000–14,500 8,614,072 1,120,637 13% 14,500–+ 776,608 105,888 14% General cargo 0–4,999 17,993,881 3,891,076 22% 5,000–9,999 15,937,373 2,326,828 15% 10,000–+ 26,463,128 3,720,868 14% Liquefied gas tanker 0–49,999 10,477,872 1,501,513 14% 50,000–199,999 28,390,114 3,641,861 13% 200,000–+ 5,313,632 697,094 13% Oil tanker 0–4,999 11,244,284 2,391,743 21% 5,000–9,999 4,339,055 580,383 13% 10,000–19,999 2,038,769 260,104 13% 20,000–59,999 12,307,094 1,696,973 14% 60,000–79,999 9,870,325 1,326,081 13% 80,000–119,999 25,724,409 3,405,958 13% 120,000–199,999 16,846,138 2,271,416 13% 200,000–+ 35,612,562 4,762,621 13% Other liquids tankers 0–+ 631,061.4 222,835 35% Ferry – pax only 0–1,999 8,065,654 1,839,021 23% 2,000–+ 937,766.4 142,744 15%
246 Third IMO GHG Study 2014 Ship type Size category Mean Standard Deviation Standard deviation as a % of mean Cruise 0–1,999 765,518 201,026 26% 2,000–9,999 541,192.7 69,983 13% 10,000–59,999 6,777,427 814,564 12% 60,000–99,999 15,272,130 1,847,344 12% 100,000–+ 10,858,883 1,327,775 12% Ferry – ro-pax 0–1,999 3,196,211 728,938 23% 2,000–+ 25,101,829 3,483,843 14% Refrigerated bulk 0–1,999 15,681,223 2,347,187 15% Ro-ro 0–4,999 11,194,992 2,907,801 26% 5,000–+ 13,214,632 1,585,173 12% Vehicle 0–3,999 6,049,479 791,876 13% 4,000–+ 17,618,246 2,094,463 12% Yacht 0–+ 2,903,868 506,778 17% Service – tug 0–+ 14,861,465 4,114,117 28% Miscellaneous – fishing 0–+ 31,227,450 11,465,708 37% Offshore 0–+ 24,875,547 4,053,364 16% Service – other 0–+ 10,982,136 1,989,317 18% Miscellaneous – other 0–+ 3,750,878 2,112,923 56%
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