#26 "No fix" handled as "position 0"

open
nobody
None
5
2006-02-17
2006-02-17
Yann Dirson
No

It should instead keep last-known value, and recognize
the "no fix" flag as such.
That would eg. allow to keep the map under the eye even
within a tunnel or home.

Similarly looking, the altitude indicator keeps
flashing between 0 and the measured value - I cannot
assert the problem is the same, though.

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