# EM7455 Cannot Obtain GPS Fix

**URL:** https://forum.sierrawireless.com/t/em7455-cannot-obtain-gps-fix/27694
**Category:** MC/EM Series
**Created:** [August 23, 2022, 9:47pm UTC](https://forum.sierrawireless.com/t/em7455-cannot-obtain-gps-fix/27694 "2022-08-23T21:47:49Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![m.turcsin](https://avatars.discourse-cdn.com/v4/letter/m/bc79bd/32.png) [@m.turcsin](https://forum.sierrawireless.com/u/m.turcsin)
#### Post date: [September 1, 2022, 9:56am UTC](https://forum.sierrawireless.com/t/em7455-cannot-obtain-gps-fix/27694/3 "2022-09-01T09:56:02Z")

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Hello. I have the same problem.  
But with MC 7455 on latest Generic Firmware.  
With USB composition=9 I can Monitor Satelites with Sierra GNNS Tool. But no fix at all.  
With USB composition=8 I don’t even get a NMEA Stream.  
But I need also a USB Composition with MBIM because it should work in a simple way with Microsoft Maps.

I blocked some Pins to run the Card in USB Mode on the internal M2 slot.

What way I need to walk to get this running with a generic flashed Module? I also use dedicated Connector and Active GNNS Antenna. I will post a AT Output related to the Initial posting for comparing when im Home.

BTW. The Modem on the other Hand works like a charm. Fast and stable with 150/50Mbit inside a Fz-g1.

I tried to use the informations in [My MC7710 can't work on Linux after plug-in it to Windows8 - #2 by rickyUm](https://forum.sierrawireless.com/t/my-mc7710-cant-work-on-linux-after-plug-in-it-to-windows8/7986/2)  
That include a lot use full informations for the 7455 too.

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