> http://www.flightradar24.com/ http://www.flightradar24.com/
> and
> http://shipfinder.co/ http://shipfinder.co/
M,
Thanks for those. Very interesting.
Has anyone on this list tracked bats or birds by radar? I looked into this=
with a friend some years ago with a view to using small ship radar to track=
bat migration routes. It is assumed that bats can fly from France to
Southern England such as Myotis alcathoe and possibly Rhinolophus spp. but=
this hasn't been proved.
The block with radar detection seemed to be the expense, compounded with th=
e
licencing of a mobile radar set in the UK. According to
http://www.detect-inc.com/wind.html
bats can be radar detected at 3 to 8 miles, but the cost of the radar rig
was not given.
Reference: There is a table in the Eurobats Document No. 3 Table 2
http://www.eurobats.org/sites/default/files/documents/publications/publicat=
i
on_series/pubseries_no3_english.pdf
giving the maximum ranges various species can be detected by ultrasound due=
to air absorption. The maximum detectable distance for a Noctule bat (at 17=
KHz) was 100 to 150 metres and only 5 metres for a Lesser horseshoe bat (at=
110KHz).
David Brinicombe
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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