Navigation Subsystem

When Boeing presented its concept for the LRV navigation system, Morea and his NASA team felt the system was overly complex and that with such complexity came the risk of potential failure. The astronauts could not afford to lose their navigation system, especially as there was no redundancy.

"From the standpoint of navigation," Morea said, "Boeing proposed a very complex inertial guidance platform for the vehicle that our engineers at Marshall felt was too sophisticated for the job to be done. By running a few simple tests at the Marshall laboratories, we came up with a concept we felt was a major improvement

[and which] we felt Boeing should consider. This system ultimately ended up being developed by Boeing.''

The MSFC Astrionics Laboratory's Guidance and Control Division set to work to engineer a simple and utterly reliable navigation system. Working with the Sensors Branch, a dead-reckoning system was conceived, based on several years of previous study and investigation. The systems studied ran the gamut of simple direction finders to systems using satellite navigation. For the LRV, the system had to meet the same requirements as other subsystems, namely simplicity, reliability, light weight, ruggedness and low power consumption. In addition, it had to be relatively intuitive to minimize crew familiarity training, it had to retain navigation

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