A few hints of how I get this working on my Note 3 rooted stock 4.4.2.
1.Install the apk
2.Go to data/data/com.garmin.android.apps.gmobilext/lib
3.copy the right libgarminos.so and give permission rwx r-x r-x
4.copy the libasusscreendict.so, libasusscreendictservice.so and libgmxt.so in system/lib/ and give permission rw- r-- r--
5.rename your old Garmin folder from extSdCard in gmxt
6.unlocked map need to be on this folder as gmxt/.System/gmapprom.img

question on the red highlight above.
which one is correct permission, rwx r-x r-x or -rwxr-xr-x with equivalent number of 755? this kind of confuse me. can we have what is the equivalent number on that particular permission.