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1.2
System Description
The ME-183 NAV integrates with existing equipment, as illustrated in Figure 1-2.
Installation of the ME-183 NAV requires an on-board navigation system (GPS)
supporting NMEA 0183 output, in addition to an Artex ME406 ELT system. The GPS
receives satellite signal information, calculates latitude and longitude position, and sends
the position data to the ME-183 NAV.
If the ELT is programmed with a short message (non-location protocol), it must be
reprogrammed to a long message (location protocol) in order to interface with the ME-
183 NAV.
NOTE
: The appropriate ME406 ELT user manual should be consulted for more detailed
information on ELT protocols and programming.
1.3
Operational Overview
The ME-183 NAV receives power from the GPS receiver via its data output. Upon power
up, there is an initial 80-second charge time before the ME-183 NAV can respond to an
ELT activation event.
The ME-183 NAV periodically receives position data from the GPS receiver and converts
the position data to an ELT compatible format.
The ME-183 NAV stores position data in RAM and waits for a signal from the ELT
indicating it has been:
•
Activated automatically by the G-Switch, or
•
Activated manually via the ELT local or cockpit remote switch.
As long as the ELT is activated and the GPS receiver continues to supply position data,
the ME-183 NAV attempts to transmit current position data every 2 seconds; however,
the ELT locks position data upon activation and will only accept new data if it is reset
using the local or remote switch.
Figure 1-2: ME-183 NAV Interface System Integration Block Diagram
