GNSS Chipset Performance - Galileo

[GPSrChive]

I wasn't exactly sure where to make this post, but since I made the following observations while researching eTrex SE Bug 5, I decided to place it here.

eTrex SE Bug 5: The Galileo ID numbers displayed on the Satellite page are incorrect (subtract 47 from each for correct ID).

While comparing the eTrex SE to other Garmin devices to create supporting documentation, I couldn't help but notice that models sharing unique GNSS chipsets also favored specific satellites. All screen captures below were taken at the same location within a minute of each other. For these examples, we were focusing on the Galileo constellation.

The eTrex SE and GPSMAP 67/67i both found 7 Galileo satellites with the Airoha AG3335M/N GNSS chipset:

Airoha AG3335M/N

Airoha AG3335M - SE - 67 - v3.png

The GPSMAP 65 and GPSMAP 66sr both found 6 Galileo satellites with the BCM47758 GNSS chipset:

BCM47758

BCM47758 - 65 - 66sr - v3.png

The GPSMAP 66s/st/i and Montana 7x0 all found 3-4 Galileo satellites with the Type M5 (3313) GNSS chipset:

Type M5 (3313)

Type M5 3313 - 66s - 66i - 700 - v3.png

[Nail]

If you put it together like this, we'll talk about the capabilities of each chipset.

Type M5 (3313) vs BCM47758 vs Airoha AG3335M

Type M5 vs BCM47758 vs Airoha AG3335M v3.png

* image edited to include additional details

[Sibstr]

Firmware 3.51 has fixed the numbers of Galileo satellites
And here is some information about Airoha AG3335M/N GNSS chipsets.

Galileo numbers FW 3.51

D7NE4543.jpg

Airoha chipsets info

GNSS_chipset_AG.jpg

[fujitsu]

hello,

do you think that Garmin could improve the performance of the Type M5 (3313) with a new firmware version or is it a hardware issue?

many thanks

AA

[fujitsu]

Hello,

does anyone know who is the manufacturer of the GPS chipset Type M5 (3313)

regards
AA

[ConiKost]

I have already seen more than 4 GALILEO Sats on my 750i. Max was 6 I saw.