Abstract: Compounds useful as nucleic acid probes are disclosed. In some embodiments, the compounds have the following structure (I) or a stereoisomer, tautomer or salt thereof, wherein M, L1a, L2, L8, L1b, L3, L5, L6, L7, L4, R1, R2, R3, R4, R5, Ra, Rb, Rc, Rd, m, n, q, and w are as defined herein. Methods associated with preparation and use of such compounds are also provided.

Abstract: A system for facilitating navigation of an aircraft comprises one or more processors and a memory coupled to the processors. The memory stores data into a data store and program code that, when executed by the processors, causes the system to detect an infrared site signal indicating a site code transmitted by one or more infrared beacons that form a beacon network around a site. The site code represents a site. In response to detecting the infrared site signal, the system determines the site indicated by the site code. The system searches for two or more infrared beacon signals and detects the two or more infrared beacon signals. In response to detecting the two or more infrared beacon signals, the system determines a location of the aircraft based on the two or more infrared beacon signals.