I know, right? Whats interesting is the fact that the majority of the sirens marked on the old system map are older 2001s. I believe Indy had a batch of sirens installed in the early 1960's and then another batch installed sometime in the 1970's (they may have had some put in during the 1950's too) so I'm not entirely sure where all of the 2001s came from. I have 2 theories though:
1.) They replaced the system of HOR Super Sirexes that Indy had during WWII and the cold war
2.) They were simply installed for additional coverage