What is the NAV1 option when selecting a runway for ILS approaches?

When selecting a runway for the ILS, it lets me select NAV1, but never NAV2. I have always wondered what the NAV2 option is for. Can anyone answer this question I’ve been having?

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It’s for VORs, which are another type of lateral navigation. You can tune into a VOR, then fly on a bearing (a radial) to/from that VOR with NAV2.

Check this out:

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It is kinda odd that it doesn’t let you select nav 2, should be able to get at least a localizer and in most (probably all in IF) aircraft it can do a glideslope too.

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Thanks for the help! I really appreciate it!