On passage we keep a handwritten log in which the on-watch makes hourly entries about speed, heading, position, sea state, weather, and the like. One of the fields is barometric pressure, for which we always went down into the salon to look at the barometer. While I have seen various NMEA barometric sensors (I will be covering these in a separate article), they are still prohibitively expensive and may be overkill for those who don't plan to implement a full-on NMEA network with sensors and displays.
A inexpensive solution is the Handheld Weather Forecaster from Oregon Scientific. Although it does not output any NMEA data it has a readable screen, runs on watch batteries, and will display temperature, barometric pressure, relative humidity, time (with alarms), and moon phase.
"Handheld Weather Forecaster"
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