Hi MKSCshop,
Adding this map to the checkout page may not be very straightforward as it’s not possible to simply add externally hosted javascript to the Shopify checkout. This would need to be implemented with a checkout UI extension and you may need to re-design/ re-build the map component so that it’s not relying on an external script.
That being said, I’m sure the developer community here would be able to help you achieve what you’re looking for.