The range within which PALAOA detects vocalizations of marine mammals, strongly depends on the acoustic characteristics of calls and differs strongly between species and possibly also between seasons. Odontocetes producing high frequency clicks and calls are likely detected when they are relatively near the shelf where PALAOA is located. Similarly, the pinniped calls are also relatively high frequency and are likely to be produced by animals in the ice-covered areas surrounding PALAOA. Low frequency vocalizations of large baleen whales, in contrast, are detected over much larger ranges. Analyses estimating the distance over which animals can be detected by PALAOA are currently underway.