(Table 3) Narwhal (Monodon monoceros) sightings, group sizes and surface estimates in the Canadian High Arctic 2002-2004

The covered area given for each stratum is calculated from a strip width equal to the maximum distance at which a sighting was
reported and multiplied by the average probability of detection over that strip, g(x). The estimated coverage is calculated from a strip width equal to the maximum distance at which any sighting was reported in each year, minus the left truncation distance. The strip is then multiplied by the linear survey effort (km) and the average probability of detection over that stratum, g(x), to give the approximate survey coverage.