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Re: VMG -- Problems and reflections [Re: Cap'n Vic] #14409
01/13/13 10:06 PM
01/13/13 10:06 PM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Oops - you were on that leg with me Vic! That was my birthday present that year. I have similar pictures on the way back too....
[Linked Image]

Attached Files
Headed East.jpg [472.86 KBytes] - (799 downloads)
Re: VMG -- Problems and reflections [Re: Cap'n Vic] #14410
01/13/13 10:11 PM
01/13/13 10:11 PM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline OP
Senior Member
Cap'n Vic  Offline OP
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
re Polars ... if we were doing 5.8+ downwind ... then true wind speed would have been somewhere in that 12-14 range, but we had boat motion and a bit of helm work to keep on course ... so I'm thinking I was in that coin toss zone today.

It would be nice if we had that nice sheltered water of Narraganset Bay down here ... but that only happens when the wind is out of the East.

Re: VMG -- Problems and reflections [Re: Cap'n Vic] #14454
02/03/13 08:56 AM
02/03/13 08:56 AM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline OP
Senior Member
Cap'n Vic  Offline OP
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
So OK ... I can't get either of two Garmin 440s to work reliably providing a VMG to waypoint.

However, my old GPS 76 ... with only a black and white screen ... ~10 year old? ... has no problems.

here's a photo of what we are trying doing so far.

[Linked Image]

Interestingly I had to recently buy a PC with ME on it to download data from a couple hundred 3.5 disks. $15.

But this now so called "legacy" computer also provides a glitch free base so that I can now load waypoints and routes directly into the old 76. Lots of things happened when MS went to xp ... and a number of "older" equipment lost support.

Attached Files
eIMG_1089.jpg [58.55 KBytes] - (727 downloads)
using an old GPS black/white for VMG
Re: VMG -- Problems and reflections [Re: Cap'n Vic] #14455
02/03/13 10:43 AM
02/03/13 10:43 AM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Vic,

I pulled up the Garmin 440s Manual from their website. Check out these tidbits where I highlighted in blue from Page 10....
  • Fuel—turn the Fuel Rate, Remaining Fuel, Range, and Fuel Economy data bar on or off.
  • Sailing—turn the Water Speed, Wind Speed, Wind Angle, and Wind Velocity Made Good (VMG) data bar on or off. Select Wind to toggle between True and Apparent wind speed and wind angle.
  • XM Audio—displays an XM audio bar at the bottom of the screen if XM audio is available (page 68).
  • Compass Tape—displayed at the top of the screen to provide a graphical representation of heading.
Understanding How Wind VMG and Waypoint VMG Appear in the Data Bars

The chartplotter automatically switches between displaying Wind Velocity Made Good (VMG) and Waypoint VMG in the data bars.

Waypoint VMG appears under these conditions:
  • The Route Leg data bar displays Waypoint VMG when you are navigating a route or an automatic guidance line.
  • The Sailing data bar displays Waypoint VMG when you are
    navigating a route or an automatic guidance line and you turn off the Route Leg data bar.
Wind VMG appears under these conditions:
  • The Sailing data bar displays Wind VMG when you are not navigating a route or an automatic guidance line.
  • The Sailing data bar displays Wind VMG when the Route Leg data bar is on.
My take on these directions is:

1. Try setting the 440 to navigate a route or guidance line and configure the display to show the "Route Leg Data Bar" from the Navigation Chart Menu. Waypoint VMG should be shown.

2. Same as #1, now shift to the "Sailing Data Bar" and you should also see Waypoint VMG. It appears that there is a way to configure data displayed the sailing data bar, but without having the device in hand, I'm not sure how.

3. Enable both the Route Leg Data Bar and Sailing Data Bar at the same time when navigating a route. See if the VMG values are different between the two bars. If they are the the same, they both should be VMG to WP. If they are different, the VMG to WP should be correct on the Route Leg Data Bar, and bogus on the sailing data bar, since you have no wind input.

4. The only way the 440 will display VMG is if you have it networked with a wind sensor (e.g. via the NMEA 0183 interface). Since I know you don't, make sure that you have pulled up the VMG to waypoint, not VMG (e.g. test in #3 above).

Re: VMG -- Problems and reflections [Re: Rhapsody #348] #14456
02/03/13 10:03 PM
02/03/13 10:03 PM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline OP
Senior Member
Cap'n Vic  Offline OP
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
conditions a bit too agressive to work much on this today, but we do get the VMG working correctly ... but after ~10 min. the VMG blanks back to _.__ and the route has to be restarted ... will retest the other unit this weekend. and will try to do a reset to factory before we go through the process once again.

Also will see what version I have vs. current.

Really weird that the old 76 doesn't blink when you ask it to do this ... but the 440 acts like I need an EE on board.

I'm scheduled to get a new handheld soon, am for sure they will have to show me how it handles such.

Re: VMG -- Problems and reflections [Re: Cap'n Vic] #14471
02/11/13 11:21 AM
02/11/13 11:21 AM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline OP
Senior Member
Cap'n Vic  Offline OP
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
Factory reset seems to have fixed one of the GPS's.

interestingly Garmin's "get back to you in three days" on a support email question ... now at 7 days with no word.

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