[tomoose]

I've found, since 1.4 + TM1.7 that the buggers can still spot me and attack at periscope depth ergo when I get a radar warning I go beyond periscope depth (90-100ft).

I haven't seen any plane within 200m ignore me so can't speak to that apparent anomaly. Generally if they're within sighting distance they'll come at me although the odd one or two if far enough away will continue on course.