EPO expired [Bug 71]

Discussion related to the Garmin GPSMAP 66s/st GPSr
Wojtas81
Posts: 34
Joined: Fri Sep 05, 2025 11:20 pm

Re: EPO expired [Bug 71]

Unread post by Wojtas81 »

Even though it is better to download EPO data from MediaTek (as described in my above post), it is still possible to download it also from Garmin.

For whoever may be interested, here is the command to invoke from Terminal (Command Prompt).
It does essentially the same what original Garmin Express does.

Code: Select all

curl "https://api.gcs.garmin.com/ephemeris/cpe/mtk/segments?segments=28" | sed -e "s/^\[{\"gpsHours\":[0-9]*,\"data\":\"//" -e "s/\"},{\"gpsHours\":[0-9]*,\"data\":\"//g" -e "s/\"}\]$//" | base64 -d > EPO.BIN
It however requires curl, sed and base64 tools. All are typically Included in Linux or Unix systems.

But Windows contains only curl, so sed and base64 must be downloaded separately:
sed for Windows
base64 for Windows

But I have only posted the above for educational purposes. For regular user, the simplest way is to just use EPOupdate tool and forget about these magic spells.
GPSMAP 66sr, GPSMAP 64sx, Montana 680t, Oregon 700
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