using google maps api to show locations with multiple custom marker <p>I am a JavaScript newbie . i am currently experimenting with a small google map based task.i have a large set of latitude and longitudes, around thousand and for each set of latitude and longitude pair i have some value which is gained from some servey . i can catogorize each value something like excellent, good or bad </p> <p>Now for above scenario what i want to do is show all the categorized value in the specific latitudes and longitudes and use different custom marker for excellent ,good or bad value.my question is can i use Google maps api without key and how can i use multiple color based custom marker to show all the latitudes and longitudes Is there any limit to use custom marker in maps</p> <p>A help would be appreciated</p>