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Bay of Maine study area is in red box

21 offshore-trending profiles of 260 km length with 10 km between track spacing

5 cross-track profiles of 260 km at 50 km cross-track spacing

One profile over Canadian 1NS survey line for Bay of Fundy study (red line)

All flights at 25,000 ft (7.6 km) at 450 km/h

48 GPSBM’s provide onshore control to evaluate impact of gravity data

FMS/IMU provides data for removing most along-track aircraft noise

20-km filter removes remaining signal

Anticipate 2 mgal accuracy

EGM will either be EGM96 or GGM01C

Gravity anomalies will either be gridded surface data (taking into account elevations) or Faye Anomalies

For 20 km wavelength and longer, need data at 10 km spacing of filtering