Luftwaffe claim locations determined by Y- and Egon-Messung?

[Karoband]

Good evening,

The only actual Luftwaffe claim documents I have seen were those of Fw. Karl-Heinz Becker presented by Andreas Zapf in his on-line essay on the 10./NJG 11 of 2014.

Apparently, accompanying the filled-in claim form entitled "Abschussmeldung, Zerstorungsmeldung" each pilot wrote a brief performa Gefechtsbericht (Battle report).

From Becker's Battle Report for the daylight claim on 15.2.45, (Zapf, p. 72):

"… Nach Y-Messung erfolgte der Abschuss im Planquadrat KG6 um 15.46 U".


From Becker's Battle Reports for the following night claims:

21.3.45 (Zapf, p.96):

"… Der Angfriff erfolgte nach Egon-Messung im Planquadrat GG5/6."

23.3.45 (Zapf, p.99):

"… Der Abschuss erfolgte in 8000 m im Scheinwerfer. Der Standort nach Egon-Messung war GG2 um 23.50 Uhr von der 1.J.D."

23.3.45 (Zapf, p. 100) second claim:
"Der Standort nach Egon-Messung war FG8 um 23.53 Uhr von der 1. Jagddivision"

My questions are:

1. How were the locations determined?

2. When was this technology first used for claims?

3. After introduction, was this technology used on all Luftwaffe aircraft?

Thanks in advance,

Jim