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Yahoo Satellite Maps Downloader 5.19 Released at Jan,27 2009!
Yahoo Satellite Maps Downloader is a tool that help you to get small tile satellite map images from Yahoo Maps(http://maps.yahoo.com). All downloaded small images are saved on the disk. You can view downloaded maps by Map Viewer Or you can combine them into a big BMP map. Note: The downloaded images are only for your personal purpose, non-commercial use.
It is very easy to use. Click here to see how to use it.
It is a shareware, for trial version, you can not download high precision images (For trial version, the min zoom level is 6; for registered version, the min zoom level is 1). It is cost you only 29.95$!
Screenshot of downloading images
Screenshot of combining images
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As GPS units are used, data is gathered which
helps them acquire satellites quickly at the start of each use. If a device is
used daily it should be able to acquire satellites in a minute or less. Using a
GPS device while it is outdoors with a clear view of the entire sky is the
ideal condition for acquiring satellites. Please know that there can be several
different factors that may cause a GPS unit to not acquire satellites:
If your unit is trying
to acquire satellites for the first time, it may take longer than normal
to establish an initial position. If the unit is powered on and outdoors
with a clear view of the sky this should not take more than 3-5 minutes.
If your unit has not
been used for an extended period of time (more then a month), it may take
3-5 minutes to acquire satellites.
If your unit is indoors,
it may not acquire satellites. Even standing next to a window indoors will
block a majority of the sky which is needed for a device to locate and
lock onto a satellite signal.
If you have just
finished updating the software in your unit or you have performed a master
reset, your unit may take 3-5 minutes to acquire while outdoors as the
data that is used to locate satellites may have been erased.
If your unit has
traveled over 500 miles while turned off or not tracking your travel, it
may take 3-5 minutes to acquire even in ideal conditions.
If your vehicle has a
protective coating on its windshield or electronic devices which interfere
with the unit receiving signal, your unit may need an external antenna* in
order to acquire satellites.
If you suspect this to
be an issue, try taking the unit outside of the vehicle with a clear view
of the sky for 3-5 minutes so that the unit can acquire satellites. If
your unit loses satellites once moved back into your vehicle you will
most likely need an external antenna*.
If your unit is still having trouble acquiring
satellites, please ensure that it has the latest version of operating software
by using our WebUpdater program. Once
your unit is updated please allow the unit to acquire satellites outdoors in a
stationary position with a clear view of the sky.
My garmin will idle after turning it on "aquiring satelites", after awhile it will give me the white screen "trouble tracking satelites, are you indoors now?" answer "no"when the garmin asks you if you are in a particular state answer "no". It works for me everytime, don't know why, just that it works to lie sometimes.
First of all make sure your etrex is not set up to follow roads (if it has that facility). Maps are not always accurate particularly edges of lakes and forest boundaries. If your etrex can only see a few satellites then accuracy will be degraded. Make sure your body is not shielding the view of the satellites by holding the unit away from you. The accuracy of any GPS is affected by the relative position of the satellites with respect to each other. If they appear (at your location) to be in a straight line then your GPS cannot perform the trigonometrical calculations to determine your position with any accuracy. In GPS speak this is called DOP - Dilution Of Precision and can result in variable accuracy from +/-5m at best to +/-30m or worse. HTH Peter