Installing a new depth sounder transducer

[peaman]

According to all the "experts" SPW is the source you need to get true wind info.

"True wind" is what you would see if you were not moving. Everyone close by should see the same true wind. But your wind instrument sees the wind to be "apparently" more if your boat is moving into the wind, than another boat will when heading in the opposite direction. In order to calculate "true" from a reading of "apparent" wind, you need to make a vector math correction for your boat speed relative to earth.

Note too, that your sails only care about apparent wind.

 

[Kif]

Is it a full signet system?

Not sure what you mean. I believe it's a airmar dst 800 (still trying to confirm).

 

[ConchyDug]

Is the airmar going into a signet display? Like in this photo.

Or is it going into a modern MFD? Using Nmea2k or 0183?

 

[Kif]

It's connected to a Garmin via NMEA 2000. Was installed before my time. Part of a package (Garmin GNX Sail pack).

 

[ConchyDug]

Ahh that clears it up. I'm guessing you have this box installed?

You have to download the Nexus software to calibrate it. Uses the USB port on the right as pictured. Here is the Nexus manual.

Nexus Race Software Manual

 

[Marlin Prowell]

Not sure when you said “Garmin”, if you meant your MFD, or just the GNX sail pack. If you have a Garmin MFD, there is a setting to adjust the depth sounder reading on the display. I changed the depth sounder offset in my Garmin MFD so the depth reading shows the depth of the water under the keel, with a little extra for safety.

 

[Dave G.]

True wind" is what you would see if you were not moving.

The i60 instrument calculates true wind for you using STW. No need for "vector math correction". As do most other wind instruments made in the last 25 years. Which is why calibration of paddle wheel is important.

 

[peaman]

According to all the "experts" SPW is the source you need to get true wind info. I personally don't understand why that is...

I guess I misinterpreted your statement.

 

[Kif]

Hey thanks. Didn't see this post. Appreciated.