Table 9. Spatial extent of seafloor trawled in the Hatton - Rockall area during 2005: overlapping tracks merged.

Speeds (knots)	Area trawled based on *125 m gear width (km2)	Area trawled based on *80 m gear width (km2)	Area trawled based on **22 m gear width (km2)
13.0–5.0	8,051	6,067	2,227
11.5–4.5	12,041	8,983	3,192
22.0–3.0	2,710	1,837	548
31.5–5.0	13,920	10,624	3,994

Estimates based on 28 vessels engaged in bottom trawling, identified from speed profiles and pattern of activity. Overlapping tracks merged to give single area.

^*Dick Ferro, Fisheries Research Services, Aberdeen, personal communication.

^**Hall-Spencer et al., 2002 [39].

¹Davies et al., 2007 [3].

²ICES, 2007 [38].

³1.5–5.0 knots encompasses the range of bottom trawling speeds referred to by Davies et al., 2007 [3] and ICES, 2007 [38].