What do these numbers mean?

What do these numbers mean, it seems a bit weird for ft/m.

(sorry for exposing some of your callsigns)

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It shows the difference in altitude between you and the other aircraft.

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now it makes more sense, thanks

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That’s the altitude separation from you. Here’s a neat little table to understand it a bit

Altitude Altitude Difference in 1000s, Altitude Difference in 100s Altitude Difference in 10s.
+ = They are above you 1 = One thousand Feet Above 1 = One Hundred Feet above 1 = 10 Feet Above
- = They are below you 1 = One thousand Feet Below 1 = One Hundred Feet Below 1 = 10 Feet Below

Hope this helps!

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thank you.

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