Did you know that the Mission Planner portion of the ArduPilot project "was" written using LabView...
It has since been re-written to eliminate LabView in favor of C/C++ only.
Currently there is now no need to install LabView runtime.
If you just want to display your current position with Google Earth, the older Mission Planner had/has a very nice display of current position as well as of the sensor data available from the attached sensor shield which had all the triple axes gyros and accelerometers. As such it was not necessary to have it. Nowadays their new board is an all in one solution for an autopilot but is more expensive as a single board.
Perhaps you could research who wrote the first mission planner and contact them regarding how to access things with LIFA...
Otherwise... just get a copy and attach it to USB or via XBee to just use it.
The software source IS available for the access to the GPS... but I don't know of availability of that regarding the LabView code.
I only know of it because I used it for my quad copter.
There are a lot of forums for fixed wing and multirotor and land rover people using the arduPilot Mega boards.
Both at Google code and at DIYDrones.
Tim
