DentonDoc wrote on Mar 24^th, 2009 at 2:06am:

The GPS I carry has a built-in barometer.  I've checked the barometer a time or two on backpacking trips, but have yet to consult it on a canoe trip.  Come to think of it, the GPS unit has a "fishing outlook" feature ... which I've also never used. dd

Pressure, moon phase, water temp and many other factors influnce fish/living things.  When I go fishing/hunting I like to keep a journal of the conditions which include pressure and temps.  I too have a GPS with a built in barometer, and record the pressure 3 times a day and the temps at different parts of lakes.  That is just me I like gagets ect and take a more scientific approach to fishing than some.  But you cannot catch em if you do not have a line in.  I have not really changed 'if' I will fish because of of pressure changes but I do look for warmer water temps in the spring if I want to get into the smallies.  And I do like to know if a low pressure is on it's way although I always try and remember rain gear.  As with any tool it is all in how you use it and if you think it is worth the weight.