3855 - (SW) Sign and type of measurement for wet-bulb temp . . .
AIV-19
4019 - (tR) Duration of reference period. . . . . . . . . . . . . .
AIV-13
4377 - (VV) Horizontal visibility. . . . . . . . . . . . . . . . . .
AIV-15
4451 - (VS) Ships average speed made good past 3 hours
. . . . .
AIV-10
4561-(W)Past weather
. . . . . . . . . . . . . . . . . . . . . .
AIV-3
4677 - (ww) Present weather.
. . . . . . . . . . . . . . . . . . . .
AIV-2
5239 - (Zi) Ice situation and trend past 3 hours
. . . . . . . . . . .
AIV-17
AIV-2