Yaesu FT2DR Instruction Manual page 69

APRS Set mode function list
y 12 APRS TXDELAY
Set the data sending delay time.
Setting item: 100ms / 150ms / 200ms / 250ms / 300ms / 400ms / 500ms / 750ms / 1000ms
Default: 300ms
Explanation:
The preamble (data transmission delay time),
shown right, for when transmitting APRS data
can be set.
y 13 BEACON INFO
Setting the transmit beacon information
Setting item: AMBIGUITY: OFF / 1digi / 2digi / 3digi / 4digi
SPD/CSE:
ALTITUDE: ON / OFF
Default: AMBIGUITY: OFF
SPD/CSE:
ALTITUDE:
Explanation:
AMBIGUITY:
SPD/CSE:
(SPEED/COURSE)
ALTITUDE:
ON / OFF
ON
ON
This function is for masking lower denominations of your position
(longitude, latitude) to disambiguate the position of your station.
Setting this function to [OFF] disables disambiguation and
transmits the precise position information of your station.
OFF 1digi
35°38.17' 35°38.1
139°42.33' 139°42.3
If function is set to [ON], speed and directional information is
transmitted. If this function is set to [OFF], speed and directional
information is not be transmitted.
If this function is set to [ON], altitude information is transmitted.
If this function is set to [OFF], altitude information is not
transmitted.
APRS beacon transmission content
Start Transmission
Preamble
(data transmission delay time)
(Default: 300ms)
2digi
35°38.
139°42.
68
End Transmission
APRS Data
Hours
3digi 4digi
35°3  . 35°.
139°4  . 139°.