Does anyone know what the 2 numbers posted on the Navigation screen direction display means. These numbers appear on either side of the "N", "S", "E", "W", indicators at the very top of the screen when a destination is not set. I've seen these numbers range from single digits to high 3 digits (700-800). Although they appear in many places in the Navigation manual (e.g. on page 93 their values are 391 and 392), I can't find a description of what this means. I appreciate all responses.