Franko that sounds like a pretty awesome system!
Are you able to look at any trends or group together days?
I use a spreadsheet currently and I can see what % of fish were caught on what lure etc... I have to say though that it's not terribly useful just yet as it's only a couple years of data.
It would take a long time to gather enough data to be statistically significant given the variables of location, tide, weather, time of day, season, type of fishing, etc. What most people don't realize is that data is not "statistically significant" until you gather 25 or more data points. Now, consider the variables I listed above. If you change ONE variable, you start a whole new data set with one data point. For example, let's say you're fishing In Sooke, during the summer run for Chinook. The tide is a weak ebb, and it's at first light. It's a bright day, with little cloud and no rain. You catch a nice fish at the tide change, on bait at 60 feet deep. If you do that three time, in the same short window that day, you've got three data points. now, change any ONE of those variables, and you have to start a new data set.
Let's say you create a log and use it religiously to determine general trends and you make decisions of when and where to fish based on the log. You wake up one morning and consult your log for where you've caught the most fish on an ebb tide for example. You review and see that Secretary Island has been good to you. So you go there and nail a couple big smilies. you run home and put them in your log. now, you gotta ask yourself... if you've done this before, did you make your decision to fish Secretary based on good data? Probably not. You likely established your own pattern. All your fish come from Secretary on ebb tides because somewhere along the line you had a good day there and kept going back. You've caught all your good fish on ebb tides at Secretary, because that's where you go during ebb tides!
Experimental design is a science on it's own and it shows us how we can effectively use data, and how we can fall into traps. Because fishing logs are generally created and used by a single person, there is rarely enough data to support good decisions, and they are not created in a way that will limit outside influences (such as "Spring Fever"). I view my personal fishing log as a record of the good times I have had on the water as much as I view it as a data source. It will take many years to develop anything that could be truly meaningful, but I do it anyway!
All that being said Aridhol, I created a "form" layout in OneNote so that all my data could be parsed and aggregated to look for patterns. now, will any of them be legitimate, I doubt it. I have favourite places and favourite gear and that skews my results right out of the gate. I also like to fish one side of the boat over the other! I'm a superstitious science guy!