byte 5: 0 1 ? ? ? ? f1 f0
This packet only appears after a position packet with the mt bit set, and
-ususally only appears when there are two or more contacts (although
-ocassionally it's seen with only a single contact).
+usually only appears when there are two or more contacts (although
+occassionally it's seen with only a single contact).
The final v3 packet type is the trackstick packet.