How do you change the GPS output rate from a true 1Hz to 5Hz?

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To enable the 5 Hz, use OSP MID 136.  The field “Position Calc Mode” can be interpreted this way:

Bit Mapped.  When set to 1, a bit enables the function.

Bit     Function

—-      ———–

0     Almanac Based Positioning

1     Reverse EE

2     5 Hz Navigation

3     SBAS Ranging

4     Fast time Sync

So set bit 2 to a 1 to enable 5 Hz navigation.

reference OSP document