USB usage clarification

[E_Blue]

You don't get it, I don't change the baudrate to 115200bps, when I buy the GPS some of them come by default with that baudrate.
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Electric Blue

[Ttelmah]

So add the code to switch them all to 19200 or 9600.

It's fairly basic. You set up a non-uart com port on the same pins, using a different stream. One at perhaps 115200, and one at 19200. Then as part of your initialisation code have it send the command to switch to 9600, with a pause at each baud rate. The ones already set to 9600, don't actually 'recognise' the commands at the higher rates, so all the units then operate at the same rate. That is standard code on a lot of instruments that use GPS units.

[gjs_rsdi]

[Ttelmah]

As a comment, the reason for the high baud rates as standard for some of these units, is that some chipsets have a habit when updating, of giving a spurious reading. When used for things like multi-copters, this can result in the copter suddenly deciding it is hundreds of feet from where it should be, and starting to move at high speed. The software authors of the location code in the copters, therefore now take multiple readings at high rates, and reject any that move more than a few feet from the previous reading. The high rate as standard, may suggest that the unit involved is one where this is a known problem.....