1. The Inertial Navigation System Provides locational and directional data. Location determined by a Global Positioning System (GPS) device. Direction determined by an Inertial Measurement Unit (IMU). Important information to have for this kind of camera system.

2. Considering the Options Still at initial stages of consideration. D3 suggested two brands: The MicroStrain 3DM & the NovAtel SPAN. Both can be used with RS232 port.

3. Enclosure Consideration Some models contain the GPS and IMU in a single unit, others separate them. May have noteworthy impact on size and design of the system enclosure.

4. Price Consideration Not an inexpensive device: Basic 3DM:$745.00 3DM-GX1:$1495.00 Will not need most advanced unit for our purposes.