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instruments. Thus, all trends in trade that we report are for both underwater (acoustic and non-acoustic) and above-water sensors.]The world?s exports of navigational and survey instru- ments nearly doubled in 2001-2011, from $7.5 billion to $16 billion. In 2011, 63% of the exports, $10.1 billion, were accounted for by surveying, hydrographic, oceanographic, hydrological, meteorological or geophysical instruments and appliances, while navigational instruments represent- ed 37%, or $5.8 billion.As shown in Table 1 (page 36), the United States was the world?s leading exporter in navigational and survey instru- ments, representing 22% of exports in 2011. It was followed by the United Kingdom, Germany and France. Canada was the world?s  fth largest exporter of underwater instruments in 2011. In navigational instruments, Germany, France, the Unit- ed Kingdom and the United States form the leading group of exporters. In surveying instruments, the United States (26.4%) is the leader in exports, followed by the United Kingdom, France and Germany. Canada accounted for 4.2% of the navi- gational instrument exports and 5.6% of the surveying device exports in 2011. Among the top 20 exporters, Germany, China and Canada increased their share in the world market in 2001- 2011 by 6%, 3% and 2% respectively. Meanwhile, the United Kingdom and the United States lost market share during the same period by 10% and 7%, respectively. China?s exports of surveying instruments in 2001 was only a half of what Canada exported, but in 2011 the value of China?s exports surpassed Canada?s exports, accounting 6.3% of the world exports. In terms of imports, the United States is the largest import market for navigational and surveying instruments, repre- senting 17.4% of the world imports in 2011. It was followed by the United Kingdom (10.8%), Germany (7.0%), Canada (6.7%), and China (6.6%). For each subgroup of product, the United States and the United Kingdom are the two largest im- port markets, while China imported more surveying devices than navigational instruments in 2011. Canada represented 8% and 6% of the world imports in each sub-category (see Table 2, page 38.) Among the top 20 importers, China?s and Singapore?s markets have expanded the most in recent years. www.seadiscovery.com Marine Technology Reporter 37 MTR #9 (34-49).indd 37MTR #9 (34-49).indd 3711/29/2012 11:29:34 AM11/29/2012 11:29:34 AM