Not sure if this is what you're looking for. But it's a start at least. He wants to know the transom angle in relation to what... the keel? Go to Harbor Freight and buy a machinists combination square http://www.harborfreight.com/12-inch...set-92471.html Put the rule flush on the keel and the compass flush on the transom. Read the degrees of angle on the compass face. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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