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Old 10-13-2009
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Originally Posted by Yamsailor View Post
ok- I need some clarifications:

1) On the 640, are all the US Charts unlocked or is it by sub-region?

2) Can you load the charts onto a laptop and plan out routes and then download the routes back into the unit?

3) How does one update the charts? By sub-region or do you update the entire chart base?
OK--I received an e-mail from Garmin with the following responses:

1) All the US Charts are unlocked;

2) The new planning software uses the charts and can be used for planning both for G2 and G2 vision charts;

3) Charts are updated once per year at a current cost of $75 for all of the US G2 charts NOT the G2 Vision.

G2 Vision Charts are purchased by sub-region and updates are purchased by sub-region. If you do not use the G2 Vision charts, I think it is a pretty nice GPS and the Cost/Benefit seems somewhat reasonable.
There isn't a device on this world that can measure the indifference I have for that statement.
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Old 06-08-2010
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Hi everyone-
This thread has been dormant for a while. Hope nobody minds me churning it up.

I just bought the 640 and have a couple of questions/comments. I called Garmin tech support, but the tech who helped me didn't know what VMG means.

It appears that the 640 will not display VMG to a waypoint unless you have a wind instrument connected. This doesn't make any sense, and I hope I'm wrong. I had a 478 (and many previous Garmin chartplotters) that did this, and I'm totally confused as to why they would omit this. It's a trivial calculation. The Garmin support person told me that VMG was actually removed from the 478, and I'd have lost it if I'd done a software update.

Second, the optional bar across the screen that shows data from a wind instrument is cool, but Garmin doesn't seem to sell a NMEA 0183 wind instrument. Could anyone recommend a headless instrument or a converter from NMEA 2000 to 0183?

Other than the VMG gripe, this thing is really cool. I'm considering the flush mount, but it's hard to cut a hole that big in the bulkhead!

"Figment" 1978 Pearson 30 #1083
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Old 06-08-2010
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The tech person may have ment a heading sensor rather than a wind insturment. Can't imagine you would need a wind insturment. I notice that a heading reading was not available on my Garmin 3006 when I first got it. They do give you a compass display from which you can geat the heading degrees though so I have no idea why they elminated the heading degree reading. I don't really need / use the VMG function, not a racer.

Rather than cutting a big hole in the bulkhead why not mount on a piece of teak with a small hole for the wires?


Last edited by LinekinBayCD; 06-08-2010 at 11:53 AM.
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Old 06-10-2010
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Thanks for the mounting suggestion. Unfortunately, it requires 3.5" of depth for the enclosure. I'll make do with the surface mount for now. It's just in danger of getting wrecked during races.

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Old 12-29-2010
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In case anyone is interested in this GPS model, WestMarine has it on sale for $799. Their website also has a 10% off sale. Although their fine print says that the 10% off is not good on "select Garmin" items, the website did give me 10% off this item, for a net price of $719.

The 10% off sale ends today.

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Formerly posted as "RhythmDoctor"
1998 Catalina 250WK Take Five (at Anchorage Marina, Essington, on the Delaware River)
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