After reading a bunch of stuff on the internet, this excerpt sums it all up very well.
Be aware that the vertical heights displayed by your recreational GPS receiver will not agree well with USGS map elevations. The main reason for this discrepancy is the inherent poor fix geometry available for vertical determinations (the earth is always blocking some of the desired satellites) and the use of different reference surfaces for the vertical measurement. DO NOT USE GPS ELEVATIONS FOR CRITICAL NAVIGATION DECISIONS.
Or to put in my terms, the GPS unit can’t do the job at hand. This is a real disappointment since it was hoped that the unit could give me elevations while on the trails in the west. The good news is that it saves me some weight to carry since it is worthless for elevations. The well worn trails and maps take care of the horizontal controls.
When the fog lifted somewhat a trip out to the Aransas Pass Jetties seemed like a decent idea. It turned out to be a good idea. The weather down there at the parking area was 70 degrees with sunshine and light breeze. The only thing missing was something in the water to bite my bait. Not even any trash bait stealers were around. The crowd was modest.
Not all the fog was gone. This work boat was out bound and eventually disappeared into the gray. That is sort of like this year disappearing tonight.
A few folks walked by while my bait was doing no good and visited with me. It made for a nice time of trying to have tooooo much fun. TheOFM