How extra air patrols would disrupt U-boat operations

Would extra Atlantic patrol aircraft matter more through U-boat coordination, surface spotting, or containing Condor operations?

Surface spotting mattered most because it forced U-boats to dive, slowing them and breaking radio coordination.

The strongest effect of additional Catalina patrols would be finding U-boats on the surface and forcing them to dive. A submerged boat lost radio contact with command and could not reposition at its normal surface speed. Limited underwater speed and endurance made these boats dependent on surfacing during ordinary operations. Keeping them down could therefore disrupt their coordination even without sinking them. Using the same tender network to contain Condor aircraft was less practical because the Atlantic lacked suitable islands and operating positions.