jodysankey
commented
9 months ago The history chart does already have horizontal (and vertical) grid lines once the chart is large enough to label those lines. On a phone screen that's typically 2 graphs on a page, on a tablet maybe 6 or 8. One of the screenshots on play store shows this in action.
The grid lines are always on multiples of 1, 2, or 5 multiplied by a power of ten, but the charts are autoscaling so as new data comes in the min and max will change and therefore the values of the lines can also change. I feel its very important for each line to be labeled to avoid mistakes in interpretation when that happens.
MHGBlue
The history chart would be more useful for large scale ranges with a few horizontal grid lines (I suggest 3, splitting the vertical into quarters). For example, an apparent wind speed history with a range of 0-20 knots makes it hard to tell how the wind has changed. Vertical grid lines may also be helpful and could be static or dynamic (each vertical lines representing a specific time).