From: Bratislava, Slovakia
According to my understanding of the mechanics (someone confirm please) the Naval Search radar would help on these two ocassion:
1) Naval Search/ASW mission - flying this mission on day/during night has higher chance to detect target TF (be it enemy CVTF or single submarine). It also has a chance to increase DL of the found target = higher chance for strike being sent, etc.
2A) During the actual attack by search plane - Individual Search/ASW planes that found a target will try to engage it - a radar device here will increase DL of the individual ships (based on roll checks) and thus potentially steer the plane to "fatter" target. Actual attack run is done by pilot Skill check.
2B) During the actual Naval strike - DL of the targets will be increased by attacking bombers, so higher chance to attack "fatter" target. Actual attack/bomb/torpedo runs are done by pilot Skill check.
Spotting target TF during night/bad weather has much lower chance than Daylight/cloudless, so radar will definitely help here (its another check basically).
Airborne Naval Search Radar will raise the detection which will lead to increased strike probability, increase in "finding the target", increase the "fatter" target priority, etc., but will not help with hit rate of bombs/torpedoes.
It wont help with avoiding CAP.
- TF mechanics have max 10DL/10MDL level (ok, 100DL/10MDL when the ship is parked next to shore and visible to every single soldier brave enough to peek over the trench parapet) so while it helps to have 10 planes observe the target TF instead of 2, the difference to 100 observations is minimal.
- I presume similar mechanics also works with regards to targeting individual ships within TFs(more DL on a ship, more "visible" to enemy). So increasing this maximally will lead to concentration of effort on major targets vs minor escorts of 80/20 instead of 60/40.