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Serial Interface Specifications
66 Apollo GX50/60/65 Installation Manual
Frequencies used for VORs, which can also be found in the range of
108.10 to 111.95 MHz, will not be accepted in this message type.
Example message:
$PMRRV2331<Sp><Sp>><<chksm><CR><LF>
Identifier is “31 ”, indicating a runway, and the localizer frequency is 110.300 MHz.
DISTANCE/SPEED/TIME MESSAGE
If an SL30 is connected to the GX with MovMap or MapCom output the following message
will be sent to the SL30.
$PMRRV41xxxxyyyzzz<CHECKSUM><CR><LF>
xxxx is the distance to the station in 0.1nm units
yyy is the ground speed in knots
zzz is the time to the station in minutes
This message is used to output the range, ground speed, and ETA decoded from an external
RNAV sensor (DME or GPS).
Message format:
“V”.................Message class. This is a VHF NAV message.
“41”................Message identifier.
rrrr ..................Range from DME station in 1/10
th
of a nautical mile units. The first two
digits are the 10s and 1s place of the range, and the last digit is the 1/10
th
s
place. This field may range in value from 0.0 NM (“0000”) to 999.9 NM
(“9999”). If the distance from the DME station is greater than 999.9NM,
the value should be encoded as “----”.
sss...................Ground speed with respect to DME station in knots. This field may range
in value from 0 knots (“000”) to 999 knots (“999”). If the ground speed
with respect to the DME station is greater than 999 knots, the value should
be encoded as “---”.
hmm ...............Time to station in hours and minutes. This field may range in value from
0 hours and 0 minutes (“000”) to 9 hours and 59 minutes (“959”). If the
time to the station is greater than 9 hours and 59 minutes, the value should
be encoded as “---”.
Example message:
$PMRRV410983055147<chksm><CR><LF>
Range from DME station is 98.3 NM, ground speed with respect to station is 55 knots, and the
estimated time to the station is 1 hour and 47 minutes.