2 Navigational Sensors provide a
Range: 4
Mass: 20
Cost: 18
Maint: 0
1 Sensor Array provides:
Range: 4
Mass: 20
Cost: 65
Maintenance: .3
As it stands, the sensor array is 100% useless. Perhaps this was intended with some of decaying return effect that has been discussed, but without that, there is 0 benefit.