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us7070

Member Since 02 Jan 2004
Offline Last Active Today, 02:18 PM
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Posts I've Made

In Topic: You sick of reading that anologue barometer??

Today, 10:11 AM

 

I looked into the Bohiken barograph a few years ago

 

it seems to have only one calibration factor - a fixed offset that appears to include both the elevation offset and any instrument error.

 

it does seem to automatically do the temperature correction

 

the Aquatech unit can be calibrated at something like 10 values within the normal range of MSLP variation - this is better, as the instrument error is not constant across the range of pressures we might encounter. It also has an elevation offset. I think the Aquatech has no capacity for output to an instrument system or PC

 

It appears that the mintaka has two calibrations - an elevation offset, and a single instrument error correction.

 

i think what i really want is something with the high quality instrument,  and advanced calibration features of the aquatech, but with a modern interface, and the recording features of the Mintaka.., maybe just a bit updated. And, obviously NMEA out over USB.

 

I don't think there is anything like that yet

USB hasn't been a bad experience, it has worked perfectly well and setting it up in expedition and subsequently out to deckman and B&G displays is easy, giving you all the strip chart options you could ever want. With using it in a strip chart i get easy access and good viewing options via my deckscreen/tablet.

 

 

but which unit are you connecting via USB - what I have learned.., through using them.., is that not all the instruments are good enough.

 

can you calibrate it at may different pressure values, or only at one?

 

how much does the instrument drift?

 

i am on boats all the time with the B&G barometer connected to the instruments, and going to expedition - i don't trust them at all. some may work.., but i have seen enough that don't work well, that i always just ignore them, and use my own.


In Topic: "Safe hull length" for a trip around Cape Horn?

Yesterday, 05:45 PM

almost everyone sails around cape horn going _downwind_ now...

 

cape horn mostly gained it's terrible reputation from the trouble boats had sailing around it _upwind_

 

i read in a book that discussed the history of cape horn roundings that back in the "old days", when the clipper ships and whaling ships regularly went both ways.., the sailors of the day didn't even count the downwind roundings as actual roundings when keeping track of the number of times they did it...

 

they only counted the upwind roundings.


In Topic: You sick of reading that anologue barometer??

Yesterday, 01:03 PM

I looked into the Bohiken barograph a few years ago

 

it seems to have only one calibration factor - a fixed offset that appears to include both the elevation offset and any instrument error.

 

it does seem to automatically do the temperature correction

 

the Aquatech unit can be calibrated at something like 10 values within the normal range of MSLP variation - this is better, as the instrument error is not constant across the range of pressures we might encounter. It also has an elevation offset. I think the Aquatech has no capacity for output to an instrument system or PC

 

It appears that the mintaka has two calibrations - an elevation offset, and a single instrument error correction.

 

i think what i really want is something with the high quality instrument,  and advanced calibration features of the aquatech, but with a modern interface, and the recording features of the Mintaka.., maybe just a bit updated. And, obviously NMEA out over USB.

 

I don't think there is anything like that yet


In Topic: You sick of reading that anologue barometer??

23 April 2017 - 01:05 PM

 

 

Ive been using starpath minkata http://www.fischer-b.../e330202_02.pdf for a few years now, very good. Can interface into expedition and subsequently deckman. 

 
i didn't think it did NMEA out - how do you connect it to expedition?
NMEA out and then easy peasy into Expedition is one of its strong points

 

 

i believe you.., but i downloaded the manual, and searched it for "nmea".., and it didn't find anything...

 

i agree with your comment about W and P - a lot of their stuff is junk 


In Topic: Dave's perfect sailboat

23 April 2017 - 12:35 PM

I spent Friday morning with Dave. He's happier  than a pig in mud with his decision.

 

there is a lot to be said for getting something that is ready to go now.

 

even if you are young.., you have no idea what the future will bring in terms of health, or any of the other things that put a stop to sailing plans