Learn English – the meaning of staying on station in an aerospace context

meaning

The RQ-180 is smaller than that concept, and it is not clear whether it will
conduct strike missions. It is similar
in size and endurance to the Global
Hawk, which weighs 32,250 lb. and can
stay on station for 24 hr. 1,200 nm from
its base
. The much smaller RQ-170 is
limited to 5-6 hr. of operation.

What is the meaning of on station in the above paragraph? and I also don't understand the nm part in 24hr.1,200 nm.

Best Answer

"On station" means flying around the area of interest close enough to keep it under observation. The phrase you have asked about means "can fly 1200 nm from base to mission location, operate for 24 hours, and then return to base without running out of fuel." Another term is "loiter".

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