If you fish VBay and your GPS shows you that you are rolling across land, slow down. I actually like to know if the water I am in was land a few years ago for safety and fishing purposes. Dramatic changes in contours of the sea bed are places fish hang out. I had a Navonics chip but it slowed down my unit so much I chucked it. The contour lines were nice, especially since I haven't had a functioning depth finder in a year, but it wasn't worth waiting for my unit to process what was on the chip. I don't know if all chips are like this but mine is. Unless I am looking for a reef the size of a basketball court I don't much use the GPS unless I am coming in from offshore or trying to save gas. I just go slow and trust in my skeg guard. When you plow into something enough times you eventually learn where it is. The whole driving on land thing drives my OCD brother nuts though. If you are OCD it might be worth the investment.
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