protocol/aprs: extract position and symbol to frame

protocol/aprs/frame.go

@@ -13,11 +13,22 @@ var (
 
 // Frame represents a single APRS frame.
 type Frame struct {
+	// Addressing
 	Source      Address `json:"source"`
 	Destination Address `json:"destination"`
 	Path        Path    `json:"path"`
-	Raw         Raw     `json:"raw"`
-	Data        Data    `json:"data,omitempty"`
+
+	// Raw payload
+	Raw Raw `json:"raw"`
+
+	// Data contained in the raw payload.
+	Data Data `json:"data,omitempty"`
+
+	// Data extracted
+	Latitude  float64
+	Longitude float64
+	Altitude  float64
+	Symbol    string
 }
 
 func Parse(s string) (*Frame, error) {