11.   The problem with the navigation unit, called an inertial measurement unit, developed on Wednesday afternoon.

n. + unit >>共 1353
police 7.95%
army 7.16%
business 3.56%
commando 2.00%
service 1.46%
power 1.38%
security 1.13%
defense 1.09%
burn 1.04%
rebel 1.04%
navigation 0.13%
navigation + n. >>共 115
system 43.09%
equipment 6.82%
aid 3.16%
device 2.16%
instrument 2.00%
unit 1.83%
software 1.83%
bar 1.66%
error 1.33%
service 1.33%
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