Garmin GPS 72H and VMG? - Page 3 - SailNet Community
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post #21 of 43 Old 06-24-2011
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I'm not certain if this will help, on the other hand, it certainly couldn't hurt.

Here's a Link to the owner's manual on the Garmin etrex Legend.

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post #22 of 43 Old 06-24-2011
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I can assure you the 72H does compass and VMG

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post #23 of 43 Old 06-24-2011
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Thanks everyone, I will go get a 72H this morning.

fair winds,
Steve

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post #24 of 43 Old 06-25-2011
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I like to put my GPS tracks into Google Earth.

With the 72 it is complicated, having to use a download tool and the serial link. Then I have to convert the file using a third party bit of software. Then, finally, open it with GE.

My 78 requires no such steps - it is recognised as a usb drive, and the file type opens right up in Google Earth.
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post #25 of 43 Old 06-27-2011
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Quote:
Originally Posted by MarkSF View Post
I like to put my GPS tracks into Google Earth.

With the 72 it is complicated, having to use a download tool and the serial link. Then I have to convert the file using a third party bit of software. Then, finally, open it with GE.

My 78 requires no such steps - it is recognised as a usb drive, and the file type opens right up in Google Earth.
Yes, well... You get what you pay for.

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"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
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post #26 of 43 Old 06-28-2011
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I have now purchased the 72H, so thought you may like my ealry thoughts on the model.

The 72H has a USB cable but as yet I haven't managed to load any data from/to a PC. Although the Garmin website recognises the unit via the USB for registration.

As a plan to use it for info while inshore racing, I have created some routes around our fixed racing marks. Two things struck me:
1. The unit always seems to want to start navigating towards the second waypoint in the route.
2. We round several marks multiple times and thus the routes reflect this. The goto waypoint within the route appears to get confused and always goes to the last occurrence of the waypoint within the route, not the choosen waypoint of the same name.

fair winds,
Steve

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post #27 of 43 Old 06-28-2011
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Congratulations on your new purchase!

Quote:
Originally Posted by No Drama View Post
As a plan to use it for info while inshore racing, I have created some routes around our fixed racing marks. Two things struck me:
1. The unit always seems to want to start navigating towards the second waypoint in the route.
2. We round several marks multiple times and thus the routes reflect this. The goto waypoint within the route appears to get confused and always goes to the last occurrence of the waypoint within the route, not the choosen waypoint of the same name.
Not sure if this helps, but... we don't use Routes for racing around fixed marks. Passage cruising, yes; around-the-marks racing, no.

Just set up your start/finish and marks location, set the top mark waypoint long before the start using 'goto', choose which mark (waypoint) you want next after you've passed it and all will be fine and happy on board.

KISS is really important with these GPS thingys.

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post #28 of 43 Old 04-08-2012
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Re: Garmin GPS 72H and VMG?

I came across this thread as I too am trying to understand how to get accurate VMG on a 72H (using far, far away point) whilst still seeing info about next waypoint on the course. (I've used both Garmin 76 and 72H models of skippers I've sailed with, but have just bought my own 72H for AUD$149 from Whitworths)

Re using Routes on round-the-bouys races, the trick is to:
  1. create a waypoint that is the midpoint of your starting line (difficult if it's a variable position mid-river start!)
  2. Starting navigation of the selected route as you go across the start line - must be within proximity (50m+/-) of the StartingLine waypoint created in 1 in order to trigger the navigation to the first mark.
  3. The unit should then:
    1. automatically switch focus to the waypoint for the first rounding mark
    2. thereafter switch focus to each successive waypoint after passing through the proximity circle around the current waypoint (i.e. enter the circle and then leave it.)


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post #29 of 43 Old 04-08-2012 Thread Starter
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Re: Garmin GPS 72H and VMG?

I'll jump in with a recommendation here... For an upwind/downwind course, you only need one waypoint.

The upwind and downwind marks make a line. Project that line as far upwind as you can and put your waypoint there. Going to the upwind mark then means maximizing VMG and downwind means minimizing VMG, no matter what direction the wind is actually coming from.
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post #30 of 43 Old 04-08-2012
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Re: Garmin GPS 72H and VMG?

Hi Danielt63

I was wondering about that, as I now sail on a Viper 640 sports boat, in which we do both round-the-bouys club racing as well as a series of back-to-back windward/leeward short course races where top mark is 1 nm+/- from the start. The trick will be how to set this distant waypoint whilst out on the water (i.e. determining & entering a location that is 1000 nm upwind of the top mark)!?

I gather that instead of navigating a route on a W/L race (as there is only one waypoint using your method), I'd simply "Goto" the distant waypoint.

On a round-the-bouys race I want bearing, distance, etc to next mark (waypoint), so using this "distant" waypoint is not an option - can't have both.


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