For full-service non-directional stations, a modification of license application can be submitted to correct geographic coordinates within a range of up to 3 seconds in latitude and/or up to 3 seconds in longitude (§73.1690(b)(2)). The actual distance allowable for adjustment varies due to the curvature of the Earth but generally falls within about 300 to 350 feet in latitude and 200 to 250 feet in longitude. However, any changes or corrections involving full-service directional antennas necessitate a construction permit.