52 lines
1.5 KiB
JavaScript
52 lines
1.5 KiB
JavaScript
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var helpers = require("../helpers.js")
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/*
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=== GLL - Geographic Position - Latitude/Longitude ===
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------------------------------------------------------------------------------
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1 2 3 4 5 6 7 8
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$--GLL,llll.ll,a,yyyyy.yy,a,hhmmss.ss,a,m,*hh<CR><LF>
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------------------------------------------------------------------------------
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Field Number:
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1. Latitude
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2. N or S (North or South)
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3. Longitude
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4. E or W (East or West)
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5. Universal Time Coordinated (UTC)
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6. Status A - Data Valid, V - Data Invalid
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7. FAA mode indicator (NMEA 2.3 and later)
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8. Checksum
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*/
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exports.TYPE = 'geo-position';
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exports.ID = 'GLL';
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exports.decode = function(fields) {
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return {
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sentence: exports.ID,
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type: 'geo-position',
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timestamp: fields[5],
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lat: fields[1],
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latPole: fields[2],
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lon: fields[3],
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lonPole: fields[4],
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timestamp: fields[5],
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status: fields[6] == 'A' ? 'valid' : 'invalid'
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};
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}
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exports.encode = function (talker, msg) {
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var result = ['$' + talker + exports.ID];
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result.push(helpers.encodeDegrees(msg.lat));
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result.push(msg.latPole);
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result.push(helpers.encodeDegrees(msg.lon));
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result.push(msg.lonPole);
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result.push(helpers.encodeTime(msg.timestamp));
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result.push('A');
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result.push('D');
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var resultMsg = result.join(',');
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return resultMsg + helpers.computeChecksum(resultMsg);
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}
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