You're welcome, try it and you'll not be regret it
BTW. you could be pretty comfortable to use 0.7 here, dont be very hard for yourself in this calculations as you cant get even those hydrophone bearing so precised..
And dont even push yourself to measure it in too perfect time, just feel free to have 2. bearing after 9:30 and third after 11 it doesnt matter so much.... (just dont mess it by 30% or so...)
In the end you always have to get more precise information optically from periscope anyway.
This is rather for decide good approach strategy and to know which bearing to have roughly before fire to not to have to turn ubote later..