JG 77 - Ofw Heinrich Hackler - claim on 11 April 1943

[Mikkel Plannthin]

I am researching the claim that Ofw Heinrich Hackler, 8./JG 77 makes on 11 April 1943. I am uning Tony Woods claims lists.
http://don-caldwell.we.bs/jg26/claims/tonywood.htm
http://don-caldwell.we.bs/jg26/claim...2_1943_pdf.zip

I have a few questions:

1) How do I interpret "97/27/1: 100 m."? I know it is given as West of Tebourba. I presume that "97" refers to this area in the German maps, and "27/1" could be a reference I do not under stand to their Jägergradnetz. I reckon that "100 m" indicate the height.

2) For 11 April 1943 Woods indicate two claims from JG 77 from other sources. I believe this is Prien's JG 77 book. Am I right, and does anyone have more on these.

Kind regards
Mikkel