The sea level on the West Coast of North America is usually about 8 inches higher than the sea level on the East Coast of North America. The surface of the ocean and its seas varies from place to place and from minute to minute based on many different factors. Local sea level can fluctuate because of high or low air pressure, storms, high and low tides, and snow melt, rainfall and river flow into the oceans (as part of the ongoing hydrologic cycle).
The standard "mean sea level" around the world is usually based on 19 years of data that average out hourly readings of the seal level around the world. Because mean sea level is averaged around the world, using a GPS even near the ocean can result in confusing elevation data (i.e. you might be on a beach but your GPS or mapping app indicates an elevation of 100 feet or more). Again, the height of the local ocean can vary from the global average.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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