An article in the May 2012 edition of the free publication Microwave Journal shows that all of 1240-1300 MHz except for two narrow gaps will be used by global navigation satellite systems (GNSS).
The article by Rachid El Assir, Rohde & Schwarz, conatin a chart that graphically illustrates where the GNSS systems will operate in 1240-1300 MHz band.
A gap of about 3 MHz occurs at 1240 and one of about a MHz at 1259 MHz.
Read Global Navigation Satellite Systems and Their Applications
Microwave Journal http://www.microwavejournal.com/publications/1