When I go to a marina and see professionals marking where to paint a bottom they do it by putting the boat in the water fully loaded with water and fuel. Then they wade out to the boat while it is still in the water and with what looks like a grease pencil they mark a series of lines along the hull where the actual waterline is. Then they make another set of lines about 2-4" higher. They then pull the boat and use those top lines as their template for where to actually paint the bottom paint.
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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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