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Author Topic:   Chronometer/Barometer
17 bodega posted 04-08-2006 12:21 AM ET (US)   Profile for 17 bodega   Send Email to 17 bodega  
Suggest to me a good Chronometer/Barometer combination instrument that can be mounted on a console like a fishfinder combo unit, or a handheld unit that can be mounted with adapters, or a personal device that can be worn on the wrist or beltpack.

Casio has a product in the form of a multi function digital watch based unit. Give me a report of your experience using that product. Can these things be beat up pretty good?

Tissot also makes a titanium combo watch that is pretty cool for those who like the Wwiss made variety. These can be had for around $500 bucks--quite a bit more than the Casio which seems to have even more functions.

I know some of the fishfinder/chartplotters have some of this data too, so any combo type units are of interest to me. The barometer is especially handy to anticipate weather issues in advance.



jimh posted 04-08-2006 09:32 AM ET (US)     Profile for jimh  Send Email to jimh     
Most modern engines have barometers built into them. Atmospheric pressure is measured and used in computing the fuel/air ratio. Perhaps you could display the pressure using a NMEA-2000 engine instrument.

If you have a GPS receiver you already have the world's most accurate clock. GPS receivers deduce your position based on extraordinary precise measurement of time. On most of these devices you can display the time.

Thus you may already have a Barometer and Chronometer aboard your boat, although you may not have realized it.

The digital cartography used with chartplotters often contains tide table data, and, in concert with the time function of the GPS receiver, these devices can provide tide height data.

17 bodega posted 04-08-2006 07:17 PM ET (US)     Profile for 17 bodega  Send Email to 17 bodega     
Good point Jim,

I noticed today when I fired up my gps that it asked for "dayling savings time".

I checked my gps unit and it doesn't have atmospheric sensors. I may look for those features when I upgrade. It would have come in handy although it wouldn't have been much help in avoiding a hailstorm on the Pacific Ocean today. This was happening as I could see the sun rising to the east. It was spectacular. I had the bilge pump working overtime. There was about four inches of water in the rear of the boat for a while. Luckily I had full "foulies" rain gear and a gore-tex hat.

Maybe my recent interest in weather technology is due to all our rain out here. Sigh.

More rain coming.

where2 posted 04-09-2006 01:06 AM ET (US)     Profile for where2  Send Email to where2     
Get a Garmin GPSMap 76CSx. The "S" is for Sensor. It has an atmospheric pressure sensor in it and with automatic pressure trend recording. You did want a GPS unit didn't you?

For only $100 more than the Tissot watch, you can have SO much more... GPS receivers always know what time it is... Unfortunately, it's not titanium like the Tissot. However, the Garmin floats, and titanium or not the Tissot probably sinks...

Moe posted 04-09-2006 07:53 PM ET (US)     Profile for Moe  Send Email to Moe     
The "barometric" sensor on our Mercury BigFoot EFI is the manifold absolute pressure (MAP) sensor, so most of the time that's what it measures, not ambient barometric pressure. It does, however, take a measurement of the ambient barometric pressure, to establish the pressure altitude baseline, between the time the key is turned to the "On" position and the time it's further rotated to the "Start" position, according to the service manual. So I don't think you could count on it for weather.


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