Gravity Meters (Air and Sea Gravimeters)

NGA is therefore seeking a company that is capable of manufacturing and servicing dynamic airborne and marine gravity collection systems for use in small-type aircraft and marine vessels respectively to perform geophysical surveys to collect the magnitude of the earth's gravity field for global and regional gravity models. The contractor shall construct and deliver an estimated two marine gravity meters and one airborne gravity meter to NGA per year (4 years total). There is an estimated need of 12 gravity meters. The contractor shall provide three days of training for each gravity meter purchased. See attached Request for Proposal (HM157520R0018) and Statement of Work (SOW) for details. Questions are due no later than 22 June 2020 at 0900 CST. The following Question/Answer is being provided. The Q&A period has resulted in a revised Statement of Work (dated 30 June 2020); see attached SOW. The only change made to the SOW is in the Table in section 3.1. The GPS and/or INS Equipment is required with the gravity meters. No other changes have been made; response date remains the same. Question: The airborne SOW does not include any of the normal GPS equipment required with the system. I assume I need to add that in to the proposal or is there no GPS equipment needed? Answer: We need a vendor supplied GPS/INS hardware and collection software that incorporates that data for the airborne gravimeters.