adding new codes

lib/codes/HDG.js

@@ -0,0 +1,43 @@
+var Helper = require("../Helper.js");
+
+/*
+ === HDG - Heading, Deviation and Variation ===
+
+ ------------------------------------------------------------------------------
+ ******* 1   2  3 4   5  6  
+ ******* |   |  | |   |  |  
+ $--HDG,x.x,x.x,x,x*hh<CR><LF>
+ ------------------------------------------------------------------------------
+
+ Field Number:
+
+1. Magnetic sensor heading, degrees, to the nearest 0.1 degree.
+2. Magnetic deviation, degrees east or west, to the nearest 0.1 degree.
+3. E if field 2 is degrees East W if field 2 is degrees West
+4. Magnetic variation, degrees east or west, to the nearest 0.1 degree.
+5. E if field 4 is degrees East W if field 4 is degrees West
+6. Checksum
+
+*/
+
+exports.Decoder = function (id) {
+    this.id = id;
+    this.talker_type_id = "HDG";
+    this.talker_type_desc = "Heading, Deviation and Variation";
+
+    this.parse = function (tokens) {
+        if (tokens.length < 6) {
+            throw new Error('DBT : not enough tokens');
+        }
+        return {
+            id: tokens[0].substr(1),
+            talker_type_id: this.talker_type_id,
+            talker_type_desc: this.talker_type_desc,
+            heading: Helper.parseFloatX(tokens[1]),
+            deviation: Helper.parseFloatX(tokens[2]),
+            deviation_direction: tokens[3],
+            variation: Helper.parseFloatX(tokens[4]),
+            variation_direction: tokens[5]
+        }
+    };
+};

lib/codes/VHW.js

@@ -0,0 +1,52 @@
+
+var Helper = require("../Helper.js");
+
+/*
+ === VHW – Water Speed and Heading ===
+The compass heading to which the vessel is currently pointing, and the speed of the vessel through the water.
+ ------------------------------------------------------------------------------
+ *******1   2   3 4 5   6   7
+ *******|   |   | | |   |   |
+ $--VHW,x.x,M,x.x,T,x.x,x.x*hh<CR><LF>
+ ------------------------------------------------------------------------------
+
+ Field Number:
+
+ 1. Heading degrees true
+ 2. M = magnetic, T = true
+ 3. Heading degrees magnetic 
+ 4. M = magnetic, T = true
+ 5. Speed, Knots
+ 6. Speed KMH
+ 7. checksum
+ */
+
+exports.Decoder = function (id) {
+    this.id = id;
+    this.talker_type_id = "VHW";
+    this.talker_type_desc = "Water, Speed and Heading";
+    this._reference = function(char){
+        switch(char){
+            case "T" : return "true"
+            case "M" : return "magnetic"
+        }  
+    };
+
+    this.parse = function (tokens) {
+        if (tokens.length < 7) {
+            throw new Error('VHW : not enough tokens');
+        }
+
+        return {
+            id: tokens[0].substr(1),
+            talker_type_id: this.talker_type_id,
+            talker_type_desc: this.talker_type_desc,
+            heading1: Helper.parseFloatX(tokens[1]),
+            reference1:this._reference(tokens[2]),
+            heading2: Helper.parseFloatX(tokens[3]),
+            reference2:this._reference(tokens[4]),
+            speed_knots: Helper.parseFloatX(tokens[5]),
+            speek_kph: Helper.parseFloatX(tokens[6])
+        }
+    };
+};