Well I checked it and yes, SH1 uses compressed air (first of the lower right circular dials) and battery (Up right), plus also remaining oxygen (Left to the battery)
If you are dissatisfied with the way SH3/SH4 handles the passive detection (Which I also was) you simply need to adjust in sim.cfg (Plain text file, no special tools required) the values for all sensors general sensitivity to your liking, like I did:
[Visual]
Detection time=2 ;[s] ;was 0.5
Sensitivity=0.01 ;(0..1)
Fog factor=1.25 ;[>=0]
Light factor=2.8 ;[>=0] ;was 2.0
Waves factor=1.0 ;[>=0]
Enemy surface factor=350 ;[m2]
Enemy speed factor=15 ;[kt]
[Radar]
Detection time=1 ;[s]
Sensitivity=0.01 ;(0..1)
Waves factor=0.9 ;[>=0]
Enemy surface factor=5.0 ;[m2]
[Hydrophone]
Detection time=10 ;[s] ;was 1
Sensitivity=0.01 ;(0..1) ;was 0.04
Height factor=0 ;[m]
Waves factor=0.55 ;[>=0] ;was 0.75
Speed factor=15 ;[kt] ;was 20
Noise factor=0.2 ;[>=0] ;was 0.5
[Sonar]
Detection time=15 ;[s] ;was 10
Sensitivity=0.005 ;(0..1) ;was 0.01
Waves factor=0.6 ;[>=0]
Speed factor=15 ;[kt]
Enemy surface factor=100 ;[m2]
Lose time=30 ;[s]
Now I can also attack surfaced at night
