diff --git a/gitbook-docs/keys.md b/gitbook-docs/keys.md
index fde0b657..b6e4dc82 100644
--- a/gitbook-docs/keys.md
+++ b/gitbook-docs/keys.md
@@ -879,19 +879,19 @@ Current water temperature
 
 
 ## environment.wind.angleApparent
-Apparent wind angle, negative to port
+Apparent Wind Angle (AWA), negative to port
 
 **Units:**rad
 
 
 ## environment.wind.angleTrueGround
-True wind angle based on speed over ground, negative to port
+Ground Wind Angle (GWA) based on vessel's speed over ground (SOG), negative to port
 
 **Units:**rad
 
 
 ## environment.wind.angleTrueWater
-True wind angle based on speed through water, negative to port
+True Wind Angle (TWA) based on vessel's speed through water (STW), negative to port
 
 **Units:**rad
 
@@ -903,31 +903,32 @@ The angle the wind needs to shift to raise an alarm
 
 
 ## environment.wind.directionMagnetic
-The wind direction relative to magnetic north
+Wind direction over water, relative to magnetic north
+
 
 **Units:**rad
 
 
 ## environment.wind.directionTrue
-The wind direction relative to true north
+True Wind Direction over water (TWD), relative to true north
 
 **Units:**rad
 
 
 ## environment.wind.speedApparent
-Apparent wind speed
+Apparent Wind Speed (AWS)
 
 **Units:**m/s
 
 
 ## environment.wind.speedOverGround
-Wind speed over ground (as calculated from speedApparent and vessel's speed over ground)
+Ground Wind Speed (GWS), calculated from speedApparent (AWS) and vessel's speed over ground (SOG)
 
 **Units:**m/s
 
 
 ## environment.wind.speedTrue
-Wind speed over water (as calculated from speedApparent and vessel's speed through water)
+True Wind Speed over water (TWS), calculated from speedApparent (AWS) and vessel's speed through water (STW)
 
 **Units:**m/s
 
diff --git a/package-lock.json b/package-lock.json
index 7cc1463d..4b8323eb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,11 +4,20 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
-    "JSONSelect": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/JSONSelect/-/JSONSelect-0.4.0.tgz",
-      "integrity": "sha1-oI7cxn6z/L6Z7WMIVTRKDPKCu40=",
-      "dev": true
+    "@apidevtools/json-schema-ref-parser": {
+      "version": "9.0.7",
+      "resolved": "https://registry.npmjs.org/@apidevtools/json-schema-ref-parser/-/json-schema-ref-parser-9.0.7.tgz",
+      "integrity": "sha512-QdwOGF1+eeyFh+17v2Tz626WX0nucd1iKOm6JUTUvCZdbolblCOOQCxGrQPY0f7jEhn36PiAWqZnsC2r5vmUWg==",
+      "requires": {
+        "@jsdevtools/ono": "^7.1.3",
+        "call-me-maybe": "^1.0.1",
+        "js-yaml": "^3.13.1"
+      }
+    },
+    "@jsdevtools/ono": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/@jsdevtools/ono/-/ono-7.1.3.tgz",
+      "integrity": "sha512-4JQNk+3mVzK3xh2rqd6RB4J46qUR19azEHBneZyTZM+c456qOrbbM/5xcR8huNCCcbVt7+UmizG6GuUvPvKUYg=="
     },
     "JSONStream": {
       "version": "0.7.4",
@@ -19,12 +28,6 @@
         "through": ">=2.2.7 <3"
       }
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-    "abbrev": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
-      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
-      "dev": true
-    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -37,18 +40,6 @@
       "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
       "dev": true
     },
-    "ansicolors": {
-      "version": "0.3.2",
-      "resolved": "https://registry.npmjs.org/ansicolors/-/ansicolors-0.3.2.tgz",
-      "integrity": "sha1-ZlWX3oap/+Oqm/vmyuXG6kJrSXk=",
-      "dev": true
-    },
-    "ansistyles": {
-      "version": "0.1.3",
-      "resolved": "https://registry.npmjs.org/ansistyles/-/ansistyles-0.1.3.tgz",
-      "integrity": "sha1-XeYEFb2gcbs3EnhUyGT0GyMlRTk=",
-      "dev": true
-    },
     "any-promise": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
@@ -83,9 +74,9 @@
       "dev": true
     },
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-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
-      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
       "requires": {
         "sprintf-js": "~1.0.2"
       }
@@ -107,6 +98,13 @@
       "dev": true,
       "optional": true
     },
+    "arr-union": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
+      "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
+      "dev": true,
+      "optional": true
+    },
     "array-differ": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-1.0.0.tgz",
@@ -165,6 +163,13 @@
       "integrity": "sha1-x/hUOP3UZrx8oWq5DIFRN5el0js=",
       "dev": true
     },
+    "assign-symbols": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
+      "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
+      "dev": true,
+      "optional": true
+    },
     "async": {
       "version": "0.2.10",
       "resolved": "https://registry.npmjs.org/async/-/async-0.2.10.tgz",
@@ -172,20 +177,18 @@
       "dev": true
     },
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-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
-      "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
+      "integrity": "sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ==",
       "dev": true,
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-    "async-some": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/async-some/-/async-some-1.0.2.tgz",
-      "integrity": "sha1-TYqBYg1ZWHkbW5j4AtMgd3bpVQk=",
+    "atob": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
+      "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
       "dev": true,
-      "requires": {
-        "dezalgo": "^1.0.2"
-      }
+      "optional": true
     },
     "aws-sign": {
       "version": "0.3.0",
@@ -214,14 +217,6 @@
         "slash": "^1.0.0",
         "source-map": "^0.5.6",
         "v8flags": "^2.1.1"
-      },
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-        "lodash": {
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-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
-          "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4=",
-          "dev": true
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@@ -236,9 +231,9 @@
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-      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.0.tgz",
-      "integrity": "sha1-rzL3izGm/O8RnIew/Y2XU/A6C7g=",
+      "version": "6.26.3",
+      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.3.tgz",
+      "integrity": "sha512-6jyFLuDmeidKmUEb3NM+/yawG0M2bDZ9Z1qbZP59cyHLz8kYGKYwpJP0UwUKKUiTRNvxfLesJnTedqczP7cTDA==",
       "dev": true,
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@@ -251,29 +246,38 @@
         "babel-traverse": "^6.26.0",
         "babel-types": "^6.26.0",
         "babylon": "^6.18.0",
-        "convert-source-map": "^1.5.0",
-        "debug": "^2.6.8",
+        "convert-source-map": "^1.5.1",
+        "debug": "^2.6.9",
         "json5": "^0.5.1",
         "lodash": "^4.17.4",
         "minimatch": "^3.0.4",
         "path-is-absolute": "^1.0.1",
-        "private": "^0.1.7",
+        "private": "^0.1.8",
         "slash": "^1.0.0",
-        "source-map": "^0.5.6"
+        "source-map": "^0.5.7"
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-        "lodash": {
-          "version": "4.17.4",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
-          "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4=",
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
           "dev": true
         }
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     "babel-generator": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.26.0.tgz",
-      "integrity": "sha1-rBriAHC3n248odMmlhMFN3TyDcU=",
+      "version": "6.26.1",
+      "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.26.1.tgz",
+      "integrity": "sha512-HyfwY6ApZj7BYTcJURpM5tznulaBvyio7/0d4zFOeMPUmfxkCjHocCuoLa2SAGzBI8AREcH3eP3758F672DppA==",
       "dev": true,
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@@ -282,16 +286,8 @@
         "detect-indent": "^4.0.0",
         "jsesc": "^1.3.0",
         "lodash": "^4.17.4",
-        "source-map": "^0.5.6",
+        "source-map": "^0.5.7",
         "trim-right": "^1.0.1"
-      },
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-        "lodash": {
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-          "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4=",
-          "dev": true
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     "babel-helper-bindify-decorators": {
@@ -338,14 +334,6 @@
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-          "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4=",
-          "dev": true
-        }
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     "babel-helper-explode-assignable-expression": {
@@ -423,14 +411,6 @@
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-          "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4=",
-          "dev": true
-        }
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     "babel-helper-remap-async-to-generator": {
@@ -657,14 +637,6 @@
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         "babel-types": "^6.26.0",
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-          "dev": true
-        }
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@@ -754,9 +726,9 @@
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-      "resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-modules-commonjs/-/babel-plugin-transform-es2015-modules-commonjs-6.26.0.tgz",
-      "integrity": "sha1-DYOUApt9xqvhqX7xgeAHWN0uXYo=",
+      "version": "6.26.2",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-modules-commonjs/-/babel-plugin-transform-es2015-modules-commonjs-6.26.2.tgz",
+      "integrity": "sha512-CV9ROOHEdrjcwhIaJNBGMBCodN+1cfkwtM1SbUHmvyy35KGT7fohbpOxkE2uLz1o6odKK2Ck/tz47z+VqQfi9Q==",
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@@ -1041,14 +1013,6 @@
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@@ -1072,14 +1036,6 @@
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@@ -1099,10 +1055,19 @@
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-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
-          "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4=",
+        "debug": {
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+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
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+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
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@@ -1117,14 +1082,6 @@
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@@ -1139,6 +1096,80 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
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+      "resolved": "https://registry.npmjs.org/base/-/base-0.11.2.tgz",
+      "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "cache-base": "^1.0.1",
+        "class-utils": "^0.3.5",
+        "component-emitter": "^1.2.1",
+        "define-property": "^1.0.0",
+        "isobject": "^3.0.1",
+        "mixin-deep": "^1.2.0",
+        "pascalcase": "^0.1.1"
+      },
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+          "resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz",
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+          "requires": {
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+          "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
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+          "dev": true,
+          "optional": true,
+          "requires": {
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+          }
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+          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
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+          "dev": true,
+          "optional": true,
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+            "is-data-descriptor": "^1.0.0",
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+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+          "dev": true,
+          "optional": true
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+        "kind-of": {
+          "version": "6.0.3",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.3.tgz",
+          "integrity": "sha512-dcS1ul+9tmeD95T+x28/ehLgd9mENa3LsvDTtzm3vyBEO7RPptvAD+t44WVXaUjTBRcrpFeFlC8WCruUR456hw==",
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@@ -1146,12 +1177,22 @@
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-      "integrity": "sha1-RqoXUftqL5PuXmibsQh9SxTGwgU=",
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+      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
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+      "dev": true,
+      "optional": true,
+      "requires": {
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+          "dev": true,
+          "optional": true,
+          "requires": {
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+            "has-values": "^0.1.4",
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+          "dev": true,
+          "optional": true
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+          "optional": true
+        }
+      }
+    },
+    "urix": {
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+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
+      "dev": true,
+      "optional": true
+    },
+    "use": {
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+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
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+      "dev": true,
+      "optional": true
+    },
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       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/user-home/-/user-home-1.1.1.tgz",
@@ -9998,12 +9919,6 @@
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-      "integrity": "sha1-p8IW0mdUUWljeztu3GypEZ4v+T8=",
-      "dev": true
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@@ -10019,34 +9934,15 @@
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     },
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-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz",
-      "integrity": "sha1-KAS6vnEq0zeUWaz74kdGqywwP7w=",
-      "dev": true,
-      "requires": {
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-        "spdx-expression-parse": "~1.0.0"
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-      "resolved": "https://registry.npmjs.org/validate-npm-package-name/-/validate-npm-package-name-2.2.2.tgz",
-      "integrity": "sha1-9laVsi9zJEQgGaPH+jmm5/0pkIU=",
-      "dev": true,
-      "requires": {
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-      }
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-      "resolved": "https://registry.npmjs.org/validator/-/validator-9.2.0.tgz",
-      "integrity": "sha512-6Ij4Eo0KM4LkR0d0IegOwluG5453uqT5QyF5SV5Ezvm8/zmkKI/L4eoraafZGlZPC9guLkwKzgypcw8VGWWnGA=="
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/validator/-/validator-8.2.0.tgz",
+      "integrity": "sha512-Yw5wW34fSv5spzTXNkokD6S6/Oq92d8q/t14TqsS3fAiA1RYnxSFSIZ+CY3n6PGGRCq5HhJTSepQvFUS2QUDxA=="
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     "which": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
-      "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
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@@ -10058,6 +9954,12 @@
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       "dev": true
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
@@ -10065,33 +9967,38 @@
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-      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+      "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
       "dev": true,
       "requires": {
-        "string-width": "^1.0.1",
-        "strip-ansi": "^3.0.1"
+        "ansi-styles": "^3.2.0",
+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0"
       },
       "dependencies": {
-        "is-fullwidth-code-point": {
-          "version": "1.0.0",
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-          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
           "dev": true,
           "requires": {
-            "number-is-nan": "^1.0.0"
+            "color-convert": "^1.9.0"
           }
         },
-        "string-width": {
-          "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
-          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
           "dev": true,
           "requires": {
-            "code-point-at": "^1.0.0",
-            "is-fullwidth-code-point": "^1.0.0",
-            "strip-ansi": "^3.0.0"
+            "ansi-regex": "^4.1.0"
           }
         }
       }
@@ -10102,27 +10009,16 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
-    "write-file-atomic": {
-      "version": "1.1.4",
-      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-1.1.4.tgz",
-      "integrity": "sha1-sfUtwujcDjywTRh6JfdYo4qQyjs=",
-      "dev": true,
-      "requires": {
-        "graceful-fs": "^4.1.2",
-        "imurmurhash": "^0.1.4",
-        "slide": "^1.1.5"
-      }
-    },
     "xtend": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
       "dev": true
     },
     "y18n": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
-      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
+      "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==",
       "dev": true
     },
     "yallist": {
@@ -10132,43 +10028,31 @@
       "dev": true
     },
     "yargs": {
-      "version": "10.1.1",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-10.1.1.tgz",
-      "integrity": "sha512-7uRL1HZdCbc1QTP+X8mehOPuCYKC/XTaqAPj7gABLfTt6pgLyVRn3QVte4qhtilZouWCvqd1kipgMKl5tKsFiw==",
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
       "dev": true,
       "requires": {
-        "cliui": "^4.0.0",
-        "decamelize": "^1.1.1",
-        "find-up": "^2.1.0",
-        "get-caller-file": "^1.0.1",
-        "os-locale": "^2.0.0",
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
         "require-directory": "^2.1.1",
-        "require-main-filename": "^1.0.1",
+        "require-main-filename": "^2.0.0",
         "set-blocking": "^2.0.0",
-        "string-width": "^2.0.0",
+        "string-width": "^3.0.0",
         "which-module": "^2.0.0",
-        "y18n": "^3.2.1",
-        "yargs-parser": "^8.1.0"
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.2"
       }
     },
     "yargs-parser": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-8.1.0.tgz",
-      "integrity": "sha512-yP+6QqN8BmrgW2ggLtTbdrOyBNSI7zBa4IykmiV5R1wl1JWNxQvWhMfMdmzIYtKU7oP3OOInY/tl2ov3BDjnJQ==",
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
       "dev": true,
       "requires": {
-        "camelcase": "^4.1.0"
-      }
-    },
-    "z-schema": {
-      "version": "3.19.0",
-      "resolved": "https://registry.npmjs.org/z-schema/-/z-schema-3.19.0.tgz",
-      "integrity": "sha512-V94f3ODuluBS4kQLLjNhwoMek0dyIXCsvNu/A17dAyJ6sMhT5KkJQwSn07R0naByLIXJWMDk+ruMfI/3G3hS4Q==",
-      "requires": {
-        "commander": "^2.7.1",
-        "lodash.get": "^4.0.0",
-        "lodash.isequal": "^4.0.0",
-        "validator": "^9.0.0"
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
       }
     }
   }
diff --git a/package.json b/package.json
index d04514e1..4139ee92 100644
--- a/package.json
+++ b/package.json
@@ -44,9 +44,9 @@
   "homepage": "https://github.com/SignalK/specification",
   "dependencies": {
     "JSONStream": "^0.7.4",
-    "debug": "^2.2.0",
-    "json-schema-ref-parser": "^3.1.2",
-    "lodash": "^4.17.11",
+    "debug": "^4.3.1",
+    "json-schema-ref-parser": "^9.0.7",
+    "lodash": "^4.17.21",
     "tv4": "^1.2.7",
     "tv4-formats": "^3.0.3"
   },
diff --git a/schemas/groups/environment.json b/schemas/groups/environment.json
index 965c1509..082bb37e 100644
--- a/schemas/groups/environment.json
+++ b/schemas/groups/environment.json
@@ -283,17 +283,17 @@
       "description": "Wind data.",
       "properties": {
         "angleApparent": {
-          "description": "Apparent wind angle, negative to port",
+          "description": "Apparent Wind Angle (AWA), negative to port",
           "$ref": "../definitions.json#/definitions/numberValue",
           "units": "rad"
         },
         "angleTrueGround": {
-          "description": "True wind angle based on speed over ground, negative to port",
+          "description": "Ground Wind Angle (GWA) based on vessel's speed over ground (SOG), negative to port",
           "$ref": "../definitions.json#/definitions/numberValue",
           "units": "rad"
         },
         "angleTrueWater": {
-          "description": "True wind angle based on speed through water, negative to port",
+          "description": "True Wind Angle (TWA) based on vessel's speed through water (STW), negative to port",
           "$ref": "../definitions.json#/definitions/numberValue",
           "units": "rad"
         },
@@ -303,27 +303,27 @@
           "units": "rad"
         },
         "directionTrue": {
-          "description": "The wind direction relative to true north",
+          "description": "True Wind Direction over water (TWD), relative to true north",
           "$ref": "../definitions.json#/definitions/numberValue",
           "units": "rad"
         },
         "directionMagnetic": {
-          "description": "The wind direction relative to magnetic north",
+          "description": "Wind direction over water, relative to magnetic north",
           "$ref": "../definitions.json#/definitions/numberValue",
           "units": "rad"
         },
         "speedTrue": {
-          "description": "Wind speed over water (as calculated from speedApparent and vessel's speed through water)",
+          "description": "True Wind Speed over water (TWS), calculated from speedApparent (AWS) and vessel's speed through water (STW)",
           "$ref": "../definitions.json#/definitions/numberValue",
           "units": "m/s"
         },
         "speedOverGround": {
-          "description": "Wind speed over ground (as calculated from speedApparent and vessel's speed over ground)",
+          "description": "Ground Wind Speed (GWS), calculated from speedApparent (AWS) and vessel's speed over ground (SOG)",
           "$ref": "../definitions.json#/definitions/numberValue",
           "units": "m/s"
         },
         "speedApparent": {
-          "description": "Apparent wind speed",
+          "description": "Apparent Wind Speed (AWS)",
           "$ref": "../definitions.json#/definitions/numberValue",
           "units": "m/s"
         }
@@ -388,4 +388,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}