dont know about currents but i think having depth values displayed on the chart would be a real help, especially if youre using a real navigation mod, i usually have little clue where i am if i havent seen the sun/stars for a bit, being able to look on my chart and see the depth values would be another useful aid to fixing my position just as in rl.
Would be a heck of a lot of work though, you would essentially have to do an entire sonar survey of coastal waters with youre echolot taking a reading every 1km or so and then adding the number to the chart image.
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