The problem is that most Garmins don't display a bitmap on top of a vector line (esp. the major highway types like 0x01, 0x02 etc will be put on top of other lines). So you have to place the arrow on one side of the underlying highway, instead of in the center. See the typ file of the new generic map. This example will not work in some units though, it could be that your Garmin still makes a mess out of it :-(


[_line]
Type=0x10000
UseOrientation=N
Xpm="32 15 2  1"
"! c #0065FF"
"  c none"
"                                "
"                                "
"                                "
"                                "
"                                "
"                                "
"                                "
"                                "
"                                "
"                                "
"                                "
"                                "
"     !                          "
" !!!!!!                         "
"     !                          "
;12345678901234567890123456789012
String1=0x04,oneway
String2=0x03,eenrichtingsverkeer
ExtendedLabels=Y
FontStyle=NoLabel (invisible)
CustomColor=No
[end]

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