Just a note. Water temperatures are going to vary from place to place. The readings you get at point A may not be the same as at point B, even if they are close to each other, say a half mile. There is less variability this time of year as the water column hasn't warmed a lot yet and it will mix easier with winds and currents. But fish are very temperature sensitive and a few degrees can make a big difference. If you move form one area to another don't assume the water temps will be the same unless the new spot has no significant difference from the previous spot; you haven't moved to the other side of a reef, the depth has changed significantly, you haven't moved into a different current, the water clarity has changed, etc.