I carried both for the first few years. The Delta is so big, it helps to use both map and GPS to navigate.
For water conditions, you'll need to do your homework. CDEC(Ca. Data Exchange Center)has stations throughout Ca., and the Delta. Many of the Delta stations will give you temp, and "turbidity". It will take time to figure out all that stuff(fishing, water, weather, etc), but it's part of paying your Delta dues.
briansII
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