The closest point on the Florida coastline to Corpus Christi is the northern tip of Key Biscayne, located approximately 25 miles southeast of Miami. The closest point on the Texas coastline to Marco Island is the southern tip of Padre Island, located approximately 10 miles southeast of Corpus Christi.
Using a nautical chart or online tool, we can measure the distance between Key Biscayne and Padre Island. The nautical distance between these two points is approximately 1,100 nautical miles.
Therefore, the nautical distance between Marco Island, FL, and Corpus Christi, TX, is approximately 1,100 nautical miles.