Observers can encounter them at relatively short range if they stay inside a vehicle, but a set of good binoculars can be very helpful.
(Observers; can encounter; them; L:at relatively short range) (they; stay; inside a vehicle) (a set of good binoculars; can be; very helpful)
Observers they a set of good binoculars
can encounter stay can be
them L:at relatively short range
inside a vehicle
very helpful