How to define what unit at you RNS310 or RNS315:
Press “SETUP” —-> hold about 10 sec. On screen choise “Versions”
RNS 310 have only 3 information lines : Part number, Software versions and system hardware versions
RNS 315 have 5 information lines: Part number, Software versions, System hardware versions and Navigation data: part number and Navigation data:version
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