Compass - Accuracy and True North/Magnetic How to get reliable results?

I am running an iPhone 5 with iOS version 7.0.4

When I go to Settings:Compass, I can switch between the Magnetic North and True North settings. Oddly, the setting does not change. Where I am right now in central Vermont, the magnetic declination is somewhere in the neighborhood of 15º to 16º West. So there should be a substanstial change when switching the magnetic/true setting. There is none.

I have another gripe. Nowhere does it show on the compass display which mode is set (magnetic/true). As a boater who switches back and forth between the two modes, it is critical that I know which setting I'm on. I also have questions about the reliability and repeatability of the compass readings. Oddly, I think the compass worked better in the iOS 6 version. Why can't the setting be changed directly on the compass display? I'm fine with Apple designers getting rid of skeumorphic display stuff in favor of a different look. That's fine for me either way. What really matters is the function and ease of interpreting the display. I think Apple fell down badly on the redesign!

I think Apple could do a lot better than this.

Can someone recommend a Compass app that does a better job?

Thanks in advance.