Page 1-4 GPS 155XL/GNC300 XL Installation ManualRevision F 190-00067-221.3 LICENSE REQUIREMENTSIf any of these devices are connected to a personal computer used in home or in office, then the fourfollowing paragraphs are applicable.These devices comply with Part 15 of the FCC limits for Class B digital devices. This equipmentgenerates, uses, and can radiate radio frequency energy and, if not installed and used in accordancewith the instructions, may cause harmful interference to radio communications. However, there is noguarantee that interference will not occur in a particular installation. If this equipment does causeharmful interference to other equipment, which can be determined by turning the equipment off andon, the user is encouraged to try and correct the interference by relocating the equipment orconnecting the equipment to a different circuit than the affected equipment.Consult an authorized dealer or other qualified avionics service technician for additional help if theseremedies do not correct the problem. These devices comply with Part 15 of the FCC rules. Operationis subject to the following conditions: (1) This device may not cause harmful interference, and (2) thisdevice must accept any interference received, including interference that may cause undesiredoperation.These units do not contain any user-serviceable parts. Repairs should only be made by an authorizedGarmin service center. Unauthorized repairs or modifications could void your warranty and yourauthority to operate this device under Part 15 Regulations.The FCC requires Garmin to inform users that these units meet the more stringent requirements "ForHome or Office Use".The following guidance is provided to help ensure the proper licensing of the GNC 300XL Comm.1. The Telecommunications Act of 1996 effective February 8, 1996 provides the FCC discretionto eliminate radio station license requirements for aircraft. At present, an individual license tooperate the GNC 300XL aboard a private aircraft is not needed in many circumstances. Pleasesee FCC Fact Sheet PR5000 or contact the FCC at 1-800-322-1117 for more information.2. No license change is required for aircraft that already have a station license per FCC 404Instructions dated 1994.3. If an aircraft license is required or desired, contact the FCC at 1-800-322-1117 to request FCCform 404, “Application for Aircraft Radio Station License,” to apply for FCC authorization.The FCC also has a "Fax on Demand" service to provide forms by fax at 202-418-0177.