Historical graphs are a very nice feature. But I think they could be made even more useful by allowing more than one data type in one graph. For example having SOG and STW in one graph would give you a quick glance at how the effect of current has developed over time.
Similar BTW vs COG, or VMG vs SOG. IN all cases that I can think of the displayed data would be in the same scale and units, like all in knots or degree or..
Similar BTW vs COG, or VMG vs SOG. IN all cases that I can think of the displayed data would be in the same scale and units, like all in knots or degree or..