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However, after 200 listings it goes to page two of the map. The 150 remaining listings appear on page two. This is a problem as page two has a different iframe featuring only the 150 listings from page two.
I tried fooling with the Google Maps URL to call more than 200 listings like this: &start=0&num=400 which doesn't work.
Does anyone know how to get around this product flaw for Google Maps?
I want to be able to put as many listings on the same map as I want and call all listings through the one iframe.
Since your need is so highly specialized, I'd guess that your best hope for a dependable answer will come from the developers over there. Our forum here is focused on organic search itself, and not so much on other Google offerings.
Still, someone may spot this thread who has experience with the issue. Let's see what develops.