You can review and purchase a garmin g1000 on the following
site:https://buy.garmin.com/shop/shop.do?pID=6420. It is extremely
powerful.
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A few of Garmin's G1000 features are autopilot, customized
display, and integrated cockpit. For the full list of features and
details try checking out
https://buy.garmin.com/shop/shop.do?pID=6420&ra=true
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A garmin g1000 can range from various prices some being as low
as 100 dollars and some garmins ranging all the way up to 400.00.
Garmins may be a little expensive but they are well worth the price
you pay for them.
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Garmin eTrex is a line of GPS's put out by Garmin.
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The place to start would be the Garmin web site which has the
Garmin voices available. The Garmin forum will also have
information on Garmin voices available.