NavList:

A properly set up transit or theodolite would be VERY good when checking dip from shore, they have higher magnification (usually 20-35x),most have crosshairs and they are accurate to within few seconds of arc.

I am talking about something like a Sokkia DT240 electronic (accuracy better than 3"). 30x scope.
it would - properly setup - provide a "check" on your reflecting circle.
also something like the above would be hard to beat for accurate reading of any point of the horizon, likely better than your eye would be able to discern with even the best 7x or even 10x scope out there, especially on a hand held instrument.
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