You have the option of purchasing SD radar early in the game, but it doesn't install (shows up as a "kit") until Sept '42. So if you get a new boat and it's pre SD radar date, you cannot purchase another kit. The kit is installed but not the radar. When the correct date arrives, your SD "kit" will install into the new boat. No worries about SJ radar. You don't have to buy it or install it. Comes with every boat new or not. Accept that new boat and sink ships like you have never thought possible with the old boat.
-Pv-
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