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If the package and the source file exist, there can be a couple of reasons why it cannot locate a node.

If it is Python, make sure the node file is executable
```
chmod +x nmea_navsat_driver
```
If it is C++, make sure it is correctly defined in your CMakelists.txt and everything is compiled correctly:
```
add_executable(nmea_navsat_driver src/foo.cpp)
```
Make sure that your path is setup correctly, i.e. source the correct bash file (this seems correct for your setup)

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