HUD Format

01234567890123456789
hh:mm FFF HHH SSSkph|
messages her M RRrpm|
---------------------

FFF -- flag characters
HHH -- magnetic heading
M   -- message control indicator
kph can change to mph

messages can be up to 12 characters long

012345678901
Fuel: XXX%
Time: hh:mm     // for the clock display (?)
 yyyy/mm/dd     // for the clock display
  hh:mm:ss      // for the clock display (?)
Int temp: XX    // assume user knows units
Ext temp: XX
Dist: XXXXXX
Lat: EW.ddd     // not sure about number length
Lon: NS.ddd     //  or format

Navigation messages
012345678901
TR   // turn right
TL   // turn left
Td   // turn direction, d is in [N, E, W, S, L, R]
Go 
Pass 

Car off messages for clock dislpay
012345678901
 This Civic
Protected by
 Red LEDs!!