@peterbarker I guess we don't care about an extra 50 bytes of RAM being used? The case where the message is too long, it's only long by a few bytes I think so we could just make it 60 instead of 100.

take care of the pennies and the pounds will take care of themselves

@rmackay9 san.
The variable that stores the text is an automatic variable.
Therefore, this area is temporary.
The stack and flash memory are different.

ex:
libraries/AP_NMEA_Output/AP_NMEA_Output.cpp
The AP_NMEA_Output::update method in this file requires a large amount of stack. This method temporarily consumes over 300 bytes of stack.

ok, thanks. I think there must be a cost to having the array larger than necessary

@peterbarker if you want to go ahead and merge this then I'm OK with that.

ok, thanks. I think there must be a cost to having the array larger than necessary

Not really - these are stack allocations, so they're only temporary buffers. Our stack from the main thread is fine for this sort of thing.

The main concern is people going overboard with longer messages now! I've stared at this particular message a few times and failed to find a way to make it shorter and as understandable.

Merging this one.