# EM7565 - GNSS errors **URL:** \ **Category:** MC/EM Series\ **Created:** [October 30, 2019, 5:29pm UTC](https://forum.sierrawireless.com/t/em7565-gnss-errors/18128 "2019-10-30T17:29:49Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![koenvandeputte](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@koenvandeputte](https://forum.sierrawireless.com/u/koenvandeputte)\ **Post date:** [October 30, 2019, 5:29pm UTC](https://forum.sierrawireless.com/t/em7565-gnss-errors/18128/1 "2019-10-30T17:29:49Z")
Hi, Modem details: Manufacturer: Sierra Wireless, Incorporated Model: EM7565 Revision: SWI9X50C\_01.09.04.00 6d3218 jenkins 2019/02/26 20:33:22 GPS NMEA details set: AT!GPSNMEASENTENCE=C9FDF Which means: - Enable all GP\* sentences - Enable all GL\* sentences - Enable all GN\* sentences - Enable all GA\* sentences Errors seen: - Speed is always 0.0, no matter if there is movement or not. Applies to all RMC and VTG sentences. - Multiple GNGSA sentences are being produced. There are too many, and the final one contains an invalid field just before the CRC - Enabling GPDTM does not produce this sentence at all - Missing support for ZDA sentences (Time) Here is output from the device: $GLGSV,3,1,09,74,35,040,29,67,59,314,16,66,60,139,77,47,206,1_7F $GLGSV,3,2,09,76,70,054,75,19,037,65,00,137,84,12,000,1_70 $GLGSV,3,3,09,83,07,306,1_48 $GPGSV,3,1,10,05,49,202,29,08,09,036,21,13,71,295,31,15,35,291,31,1_61 $GPGSV,3,2,10,21,12,312,21,28,46,125,35,30,52,066,44,07,19,061,1_63 $GPGSV,3,3,10,20,27,02,004,1_54 $GPGGA,171546.00,5114.148365,N,00312.975149,E,1,05,1.4,16.9,M,47.0,M,_5A $GAGGA,171546.00,5114.148365,N,00312.975149,E,1,00,1.4,16.9,M,47.0,M,4E $GNGNS,171546.00,5114.148365,N,00312.975149,E,AAN,06,1.4,16.9,47.0,V59 $GPVTG,253.4,T,255.6,M, **0.0,N,0.0,K** ,A_27 $GAVTG,253.4,T,255.6,M, **0.0,N,0.0,K** ,A_36 $GPRMC,171546.00,A,5114.148365,N,00312.975149,E, **0.0** ,253.4,301019,2.2,W,A,V_5C $GARMC,171546.00,A,5114.148365,N,00312.975149,E, **0.0** ,253.4,301019,2.2,W,A,V_4D $GPGSA,A,2,05,13,15,28,30,1.7,1.4,1.0,1_26 $GAGSA,A,1,_23 $GNGSA,A,2,05,13,15,28,30,1.7,1.4,1.0,1_38 $GNGSA,A,2,74,1.7,1.4,1.0,2_32 $GNGSA,A,2,1.7,1.4,1.0_2F $GNGSA,A,2,1.7,1.4,1.0_2F $GNGSA,A,2,1.7,1.4,1.0, **3** _30 $GLGSV,3,1,09,74,35,040,29,67,59,314,16,66,60,139,77,47,206,1_7F $GLGSV,3,2,09,76,70,054,75,19,037,65,00,137,84,12,000,1_70 $GLGSV,3,3,09,83,07,306,1_48 $GPGSV,3,1,10,05,49,202,29,08,09,036,21,13,71,295,31,15,35,291,31,1_61 $GPGSV,3,2,10,21,12,312,21,28,46,125,35,30,52,066,44,07,19,061,1_63 $GPGSV,3,3,10,20,27,02,004,1_54 $GPGGA,171547.00,5114.148364,N,00312.975147,E,1,05,1.4,16.9,M,47.0,M,_54 $GAGGA,171547.00,5114.148364,N,00312.975147,E,1,00,1.4,16.9,M,47.0,M,40 $GNGNS,171547.00,5114.148364,N,00312.975147,E,AAN,06,1.4,16.9,47.0,V57 $GPVTG,253.4,T,255.6,M,0.0,N,0.0,K,A_27 $GAVTG,253.4,T,255.6,M,0.0,N,0.0,K,A_36 $GPRMC,171547.00,A,5114.148364,N,00312.975147,E,0.0,253.4,301019,2.2,W,A,V_52 $GARMC,171547.00,A,5114.148364,N,00312.975147,E,0.0,253.4,301019,2.2,W,A,V_43 $GPGSA,A,2,05,13,15,28,30,1.7,1.4,1.0,1_26 $GAGSA,A,1,_23 $GNGSA,A,2,05,13,15,28,30,1.7,1.4,1.0,1_38 $GNGSA,A,2,74,1.7,1.4,1.0,2_32 $GNGSA,A,2,1.7,1.4,1.0_2F $GNGSA,A,2,1.7,1.4,1.0_2F $GNGSA,A,2,1.7,1.4,1.0,3_30 ---
**Author:** ![Vianney](https://avatars.discourse-cdn.com/v4/letter/v/71e660/32.png) [@Vianney](https://forum.sierrawireless.com/u/Vianney)\ **Post date:** [November 4, 2019, 8:29am UTC](https://forum.sierrawireless.com/t/em7565-gnss-errors/18128/2 "2019-11-04T08:29:24Z")
Hi, 1st error: I cannot check your speed error because my condition doesn’t allow to test speed. 2nd & 3rd errors: I’ve not seen any errors as yours 4th error: The document doesn’t state that ZDA sentences are supported. Maybe this is a future improvement Here is output from the device: $GPGGA,082330.00,0,_42 $GAGGA,082330.00,0,53 $GNGNS,082330.00,NNN,39 $GPVTG,T,M,N,K,N2C $GAVTG,T,M,N,K,N3D $GPRMC,V,N_53 $GARMC,V,N_42 $GPGSA,A,1,32 $GAGSA,A,1,23 $GNGSA,A,1,2C $GAGSV,2,1,07,04,19,320,36,01,65,154,12,32,248,19,38,023,773 $GAGSV,2,2,07,21,42,053,31,21,201,33,24,191,74A $GPGSV,3,1,11,10,59,002,12,20,060,14,21,305,20,71,087,165 $GPGSV,3,2,11,21,35,189,24,04,036,25,47,104,26,08,201,1_69 $GPGSV,3,3,11,29,02,144,31,45,244,32,30,333,1_5C $GPGGA,082331.00,0,43 $GAGGA,082331.00,0,52 $GNGNS,082331.00,NNN,38 $GPVTG,T,M,N,K,N2C $GAVTG,T,M,N,K,N3D $GPRMC,V,N53 $GARMC,V,N_42 $GPGSA,A,1,_32 $GAGSA,A,1,23 $GNGSA,A,1,2C $GAGSV,2,1,07,04,19,320,36,01,65,154,12,32,248,19,38,023,773 $GAGSV,2,2,07,21,42,053,31,21,201,33,24,191,74A $GPGSV,3,1,11,10,59,002,12,20,060,14,21,305,20,71,087,1_65 $GPGSV,3,2,11,21,35,189,24,04,036,25,47,104,26,08,201,1_69 $GPGSV,3,3,11,29,02,144,31,45,244,32,30,333,1_5C $GPGGA,082332.00,0,_40 $GAGGA,082332.00,0,51 $GNGNS,082332.00,NNN,3B $GPVTG,T,M,N,K,N2C $GAVTG,T,M,N,K,N3D $GPRMC,V,N_53 $GARMC,V,N_42 $GPGSA,A,1,32 $GAGSA,A,1,23 $GNGSA,A,1,2C $GAGSV,2,1,07,04,19,320,35,01,65,154,12,32,248,19,38,023,770 $GAGSV,2,2,07,21,42,053,31,21,201,33,24,191,74A $GPGSV,3,1,11,10,59,002,38,14,21,305,35,20,71,087,26,32,30,333,37,16E $GPGSV,3,2,11,12,20,060,21,35,189,24,04,036,25,47,104,1_61 $GPGSV,3,3,11,26,08,201,29,02,144,31,45,244,1_52 $GPGGA,082332.44,0,40 $GAGGA,082332.44,0,51 $GNGNS,082332.44,NNN,3B $GAGNS,082332.44,NNN,34 $GPVTG,T,M,N,K,N2C $GAVTG,T,M,N,K,N3D $GPRMC,V,N53 $GARMC,V,N42 $GPGSA,A,1,32 $GAGSA,A,1,23 $GNGSA,A,1,2C $GPGGA,082333.00,0,41 $GAGGA,082333.00,0,50 $GNGNS,082333.00,NNN,3A $GAGNS,082333.00,NNN,35 $GPVTG,T,M,N,K,N2C $GAVTG,T,M,N,K,N3D $GPRMC,V,N53 $GARMC,V,N42 $GPGSA,A,1,32 $GAGSA,A,1,23 $GNGSA,A,1,2C $GPGSV,3,1,11,10,59,002,38,12,20,059,21,14,21,305,35,20,71,087,26,165 $GPGSV,3,2,11,24,04,036,28,25,47,104,24,32,30,333,36,21,35,189,16E $GPGSV,3,3,11,26,08,201,29,02,144,31,45,244,152 $GAGSV,2,1,07,04,19,320,36,01,65,154,12,32,248,19,38,023,773 $GAGSV,2,2,07,21,42,053,31,21,201,33,24,191,74A $GPGGA,082334.00,1051.395595,N,10637.873009,E,1,05,2.0,24.5,M,-1.0,M,4F $GPDTM,P90,0000.000009,S,00000.000002,W,0.998,W8451 $GAGGA,082334.00,1051.395595,N,10637.873009,E,1,01,2.0,24.5,M,-1.0,M,5A $GNGNS,082334.00,1051.395595,N,10637.873009,E,ANA,06,2.0,24.5,-1.0,V4C $GAGNS,082334.00,1051.395595,N,10637.873009,E,NNA,01,2.0,24.5,-1.0,V4B $GPVTG,0.0,T,0.9,M,0.0,N,0.0,K,A_2A $GAVTG,0.0,T,0.9,M,0.0,N,0.0,K,A_3B $GPRMC,082334.00,A,1051.395595,N,10637.873009,E,0.0,0.0,041119,0.9,W,A,V_53 $GARMC,082334.00,A,1051.395595,N,10637.873009,E,0.0,0.0,041119,0.9,W,A,V_42 $GPGSA,A,2,10,12,20,24,32,2.2,2.0,0.9,1_22 $GAGSA,A,2,04,2.2,2.0,0.9,3_32 $GNGSA,A,2,10,12,20,24,32,2.2,2.0,0.9,1_3C $GNGSA,A,2,2.2,2.0,0.9,2_38 $GNGSA,A,2,2.2,2.0,0.9_26 $GNGSA,A,2,193,194,2.2,2.0,0.9_21 $GNGSA,A,2,04,2.2,2.0,0.9,3_3D ---
**Author:** ![koenvandeputte](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@koenvandeputte](https://forum.sierrawireless.com/u/koenvandeputte)\ **Post date:** [November 4, 2019, 8:47am UTC](https://forum.sierrawireless.com/t/em7565-gnss-errors/18128/3 "2019-11-04T08:47:31Z")
@Vianney Thanks for sharing. Could you please add your current NMEA config? AT!GPSNMEASENTENCE? Which version are you running? Issue 1 is the most severe one (Speed is always 0.0) The other 3 are low prio After rebooting the module multiple times, I’m now seeing GPDTM Thanks! ---
**Author:** ![Vianney](https://avatars.discourse-cdn.com/v4/letter/v/71e660/32.png) [@Vianney](https://forum.sierrawireless.com/u/Vianney)\ **Post date:** [November 4, 2019, 8:54am UTC](https://forum.sierrawireless.com/t/em7565-gnss-errors/18128/4 "2019-11-04T08:54:14Z")
@koenvandeputte I use the same setting as yours. Here is my setting: ati9 Manufacturer: Sierra Wireless, Incorporated Model: EM7565 Revision: SWI9X50C\_01.09.04.00 6d3218 jenkins 2019/02/26 20:33:22 ESN: 12803145987, 80300103 IMEI: 357756090004611 IMEI SV: 9 FSN: UF810187020206 +GCAP: +CGSM OK at!gpsnmeasentence? !GPSNMEASENTENCE: 0xC9FDF OK ---
**Author:** ![koenvandeputte](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@koenvandeputte](https://forum.sierrawireless.com/u/koenvandeputte)\ **Post date:** [November 4, 2019, 10:40am UTC](https://forum.sierrawireless.com/t/em7565-gnss-errors/18128/5 "2019-11-04T10:40:49Z")
Some more details on the issue regarding speed: When only GPS sentences are enabled, speed is fine. When the sentences for other constellations are enable, speed is always 0.0 Smells like a bug … ---
**Author:** ![koenvandeputte](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@koenvandeputte](https://forum.sierrawireless.com/u/koenvandeputte)\ **Post date:** [February 27, 2020, 1:48pm UTC](https://forum.sierrawireless.com/t/em7565-gnss-errors/18128/6 "2020-02-27T13:48:51Z")
Ping. Any update on this from Sierra dev team? It’s pretty easy to simulate: 1 - Only enable GPS sentence bits - Get a GPS fix - Move around (see speed in NMEA strings) --\> OK 2 - Enable GPS + GLONASS/GALILEO sentence bits - Get a GNSS fix - Move around (see speed in NMEA strings) --\> BAD, speed is always 0.0 ---
**Author:** ![koenvandeputte](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@koenvandeputte](https://forum.sierrawireless.com/u/koenvandeputte)\ **Post date:** [June 11, 2020, 9:47am UTC](https://forum.sierrawireless.com/t/em7565-gnss-errors/18128/7 "2020-06-11T09:47:13Z")
Retested on revision: SWI9X50C\_01.11.00.00 5ba42f jenkins 2019/06/28 09:51:52 The main issue is still the same: - Speed is 0.0 in all sentences when other GNSS constellations besides GPS are also enabled