rivhtung zwischen 2 "Gegenständen" bestimmen

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hey leute,
ich möchte gerne die richtung zwischen 2 gegenständen(sender /empfänger)  bestimmen. das ganze sollte bis zu 500m reichweite haben.
 ich dachte, dass der sender ein signal ausstrahlt und der empfänger kann bestimmen aus welcher richtung das signal kommt.
ich möchte das gerne im wasser einsetzen. das soll heißen, wenn 3m hohe wellen sind sollte das system immernoch funktionieren. 

programmier kenntnisse hab ich in c cpp java
leider bin ich in elektronik nicht bewandert.

2 gps module und eine xbee pro funkverbindung zur Übermittlung. kostenpunkt 100€


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