I think the key to making this a jem would be to allow it to calculate tide lags according to different tide heights due to the moon phase- anyone can look at a chart and say i have to be there 2 hours before high, but if its a week tide and you forget to take that into account, your timing might be off and you may miss the bite-
other features that would be cool is an option to upload an image be it an areal photo or a pic of a scetch of the prime standing rocks so you can remember them and a imput section for notes about past experiences
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