MOST OF THE HIGHER END GARMIN GPS UNITS SUCH AS THE COLORADO 400 AND THE OREGON 400 OR HIGHER ALL HAVE BUILT IN BAROMETERS THAT WILL EVEN GRAPH THE PRESSURE PATTERNS OVER TIME. THEY ALSO HAVE HUNT/FISH TABLES AND SUN & MOON RISE/SET TABLES. I JUST STARTED USING MINE TO GRAPH PRESSURE CHANGES AND ON PECK BETWEEN CHRISTMAS AND NEW YEARS, FISHING STARTED OUT GOOD WITH A STEADY TO SLIGHTLY FALLING BAROMETER, BUT BY MID-WEEK, THE BAROMETER STARTED FALLING FAST AND FISHING LITERALLY SHUT OFF AS A STORM MOVED IN. WANTED TO STAY UNTIL THE PRESSURE STABILIZED TO SEE HOW THINGS CHANGED, BUT WORK COMMITMENTS WOULDN'T ALLOW IT. WE WERE CATCHING ABOUT 15 FISH A DAY EARLY ON AND ON THE LAST NIGHT AND FOLLOWING DAY, WE DIDN'T CATCH ANYTHING! THIS WAS BASED OVER 5 DAYS OF FISHING. ALSO FISHED YELLOWTAIL AND THE BAROMETER WAS SLIGHTLY FALLING DURING THE MORNING AND WE PICKED UP QUITE A FEW LING AND WALLEYE. BY EARLY AFTERNOON, THE PRESSURE STARTED DROPPING AS A STORM STARTED MOVING IN AND FISHING ONCE AGAIN COMPLETELY SHUT-OFF. DURING BOTH OF THESE EVENTS, THE FISH/HUNT TABLES SAID POOR TO OK FISHING. I DIDN'T CHECK THE SUN/MOON RISE/SET TABLES, BUT I'M GOING TO DO SOME RESEARCH AND SEE WHERE THEY WERE AT. AS FOR WIND, IT WAS COMING STEADILY OUT OF THE NORTH OR NORTHWEST ON PECK, DUE WEST ON YELLOWTAIL. DON'T KNOW IF THIS HELPS ANYONE, BUT THOUGHT IT WAS INTERESTING. GOOD FISHING!