interpretation assistance requested; re: AI sensors

OK, for the most part I've had no trouble interpreting settings in the various .dat and .sim files. I've a new project in mind and I was investigating the AI_Sensors.dat file and I'm a bit confused with the meaning of some of the settings for the AI Hydrophone.

MinRange and MaxRange seem to be the minimum and maximum ranges the hydrophone can 'hear'.

MinHeight and MaxHeight seem to be the minimum and maximum heights the hydrophone can 'hear'. As Maxheight is set at 0 and MinHeight at -235 I'm interpreting this to mean the AI hydrophone can 'hear' from the surface to 235 meters down.

MinBearing and Maxbearing, and MinElevation and MaxElevation, though, are what is confusing me.

MinBearing=0
Maxbearing=130
MinElevation=70
MaxElevation=180

Eh?

Could some kind soul please explain to me what these values do and how they affect the AI hydrophone?

Danke!

~Albrecht