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4 - Indicator figure for pressure group
PPPP - Pressure in hPa (millibars) and tenths
Only initial 1 is omitted
e.g.
998.6 hPa is coded 9986
1014.7 hPa is coded 0147
Notes

- The hectopascal (hPa) is numerically equivalent to the millibar (mb)
- Because Auxiliary ships are not equipped with tested instruments permitting the determination of tenths of hPa of pressure, a solidus (/) should be coded for the tenths of hPa.