Hello

I'm about to develop a site that will make a massive usage of google
maps.
I've read the documentation but still have some questions. Thanks for
answers to some of them and/or links to answers.

1. Can you detect and launch an event when the user moves the map by
click and press on some point and move the mouse? I want to know if
I'll be able to switch the visibility of GMarkers according to the
map's visible area to the user and according to the zoom level.

2. Is there maximum amount of different routes (created from a
GDirections object) that you can display on one map? Is there maximum
amount of different points that you can add to a single route?

3. Can any 2 (lat,lng) points be connected in a route? If no, in which
cases (when there is no highway between 2 points, when there is an
ocean between 2 points, etc.)?

4.Is there any limitation of the number of queries that a site can
request per a time unit?

5. Are there any differences between using maps.google.com and using
the api?

6. What is the main difference between api v2 and v3? Should I
consider working with v3 and is there any capabilities it isn't
supports?

Thanks a lot,
Elad.
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