One of the methods is to check the Admiralty Sailing Directions for the area the vessel is currently at. The surface pressure chart of that area will state the Value which is expected in that month and location. This method, unfortunately, is not always accurate and there can be variations in reading that might be encountered. The best way here is to compare your readings with vessels in the vicinity. Similar readings will suggest that the Barometer is showing correct readings. This is certainly the quickest way of determining the accuracy of your Barometer.

One of the methods is to check the Admiralty Sailing Directions for the area the vessel is currently at. The surface pressure chart of that area will state the Value which is expected in that month and location. This method, unfortunately, is not always accurate and there can be variations in reading that might be encountered. The best way here is to compare your readings with vessels in the vicinity. Similar readings will suggest that the Barometer is showing correct readings. This is certainly the quickest way of determining the accuracy of your Barometer.