function tab_initialize_gps () {
    // enable data pulling
    timers.push(setInterval(gps_pull, 75));  
}

function gps_pull() {
    // Update GPS data
    $('.GPS_info td.alt').html(GPS_DATA.alt + ' m');
    $('.GPS_info td.lat').html((GPS_DATA.lat / 10000000).toFixed(4) + ' deg');
    $('.GPS_info td.lon').html((GPS_DATA.lon / 10000000).toFixed(4) + ' deg');
    $('.GPS_info td.speed').html(GPS_DATA.speed + ' cm/s');
    $('.GPS_info td.sats').html(GPS_DATA.numSat);
    $('.GPS_info td.distToHome').html(GPS_DATA.distanceToHome + ' m');
    
    // Update GPS Signal Strengths
    
    var e_ss_table = $('div.GPS_signal_strength table tr:not(.titles)')
    
    for (var i = 0; i < GPS_DATA.chn.length; i++) {
        var row = e_ss_table.eq(i);

        $('td', row).eq(0).html(GPS_DATA.svid[i]);
        $('td', row).eq(1).html(GPS_DATA.quality);
        $('td', row).eq(2).find('progress').val(GPS_DATA.cno);
    }
    
    send_message(MSP_codes.MSP_STATUS, MSP_codes.MSP_STATUS);
    send_message(MSP_codes.MSP_RAW_GPS, MSP_codes.MSP_RAW_GPS);
    send_message(MSP_codes.MSP_GPSSVINFO, MSP_codes.MSP_GPSSVINFO);
}