DBK, DBS and DBT

[Haavard94]

Does anyone know how to add one of the sentences DBK, DBS, or DBT?

[dotMorten]

See the section on adding custom messages:
https://dotmorten.github.io/NmeaParser/concepts/CustomMessages.html

It'll probably be something along the lines of:

public abstract class DepthBelowBaseMessage : NmeaMessage
{
    protected DepthBelowBaseMessage(string type, string[] parameters) : base(type, parameters)
    {
        WaterDepthFeet = parameters.Length > 0 ? ReadDouble(parameters[0]) : double.NaN;
        WaterDepthMeters= parameters.Length > 1 ? ReadDouble(parameters[1]) : double.NaN;
        WaterDepthFathoms = parameters.Length > 2 ? ReadDouble(parameters[2]) : double.NaN;
    }
    public double WaterDepthFeet { get; }
    public double WaterDepthMeters { get; }
    public double WaterDepthFathoms { get; }

    private static double ReadDouble(string value)
    {
        if(value != null && double.TryParse(value, NumberStyles.Any, CultureInfo.InvariantCulture, out double result))
        {
            return result;
        }
        return double.NaN;
    }
}
[NmeaMessageType("--DBK")]
public abstract class DepthBelowKeelMessage : DepthBelowBaseMessage 
{
   public DepthBelowKeelMessage(string type, string[] parameters) : base(type, parameters)
   { }
}
[NmeaMessageType("--DBS")]
public abstract class DepthBelowSurfaceMessage : DepthBelowBaseMessage 
{
   public DepthBelowSurfaceMessage(string type, string[] parameters) : base(type, parameters)
   { }
}
[NmeaMessageType("--DBT")]
public abstract class DepthBelowTransducerMessage : DepthBelowBaseMessage 
{
   public DepthBelowTransducerMessage (string type, string[] parameters) : base(type, parameters)
   { }
}