public void Update(String line)
{
try
{
//validate checksum first
if (IsValidChecksum(line))
{
if (line.StartsWith("$GPGGA"))
{
FixData newFix = FixData.Parse(line);
if (newFix != null && newFix.Valid)
{
//compute vertical speed
int newAltTimeSeconds = (newFix.Time.Hour * 3600)
+ (newFix.Time.Minute * 60)
+ (newFix.Time.Second);
double dt = newAltTimeSeconds - lastAltTimeSeconds;
if (lastAltitude > 0 && dt > 0)
{
double newVS = (newFix.Altitude - lastAltitude) / (dt);
VerticalSpeed = VerticalSpeed + 0.2f * (newVS - VerticalSpeed);
}
lastAltitude = newFix.Altitude;
lastAltTimeSeconds = newAltTimeSeconds;
//compute maximum altitude
if (newFix.Altitude > MaximumAltitude)
{
MaximumAltitude = newFix.Altitude;
}
}
this.Fix = newFix;
}
else if (line.StartsWith("$GPRMC"))
{
this.Movement = MovementData.Parse(line);
}
else if (line.StartsWith("$GPGSV"))
{
this.Satellites = SatellitesData.Parse(line);
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}