RightWay GPS Navigator RW 430 - Manual (Page 135)

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Note: The time is displayed in military time. In military time, the hours are numbered
from 00 – 24 instead of 12 hours AM and 12 hours PM. Using the military
time system, any number smaller than 12 is AM while any number larger
than 12 is PM. So 01 would be 1 AM and 13 would be 1 PM. The minutes
are the same as regular time. To convert military time to regular time,
subtract 12 from any number over 12. If the time reads 18:40, that means it
is 6:40 PM. (18
– 12 = 6)