For the technical answer please refer to my earlier post “GPS TinyShield does not provide actual altitude” on this forum.
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The 5 Hz command for the Telit JF2 GPS has been taken from the chapter ” Enable 5Hz Update NMEA” from “Telit_Jupiter_JF2_EVK_User_Manual_r0.pdf” found on internet:
"$PSRF103,00,6,00,0*23\r\n"
Unquote
Regards,
Willem