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If you have a buddy with a decent FF he can read well, doesn't have to by identical to yours but it helps, paddle along with him and compare what you see on yours vs his. You can get interfearance between units if your too close some times. If he's confident on what he is seeing you can match his settings or see what your unit reports while he's telling you what is actually under you. Don't know how many do this but it can provide direct real time knowledge. Mike.
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