IJN and sound velocity profile

Hello, this is a serious question.
I'm looking for information about possible exploitation of sound velocity
profile (SVP) or bathythermography (BT) by the Japanese during WW2.
As far as I know, no IJN surface warship had any device to measure SVP or
BT, and convoy escorts simply ignored sound propagation conditions when they
tried and establish a screen around a convoy, leading to irrelevant position
of sonar-equiped ships. On the other hand, IJN submarines did exploit
temperature gradients to escape from detection, in 1944-45 at least but
maybe earlier. So what ? Did they never exchange their experiences, or did
they but lacked time / means to inforce relevant tactics in surface forces?
Has anyone some relevant info ?

Regards,
Christophe Chazot


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