Case for the Eggtimer RX Dongle and BT Trasnsmiter. This will allow you to use your Eggtimer GPS devices with only a phone (you will still need to configure the RX with the LCD Rx.

Eggtimer Rx "Dongle"
https://eggtimerrocketry.com/home/eggfinder-gps-tracking-system/

DSD Tech HC-06 Wireless Bluetooth Serial Transceiver
https://a.co/d/2lNty7V

Used with a Samsung S22+. You will need to enable developer options and then select mock location. (Google can help you figure this part out, its pretty simple)

The apps i use Bluetooth GPS by GG Moblab 1.3.7
https://bluetooth-gps.en.uptodown.com/android
This version isn't "supported" on newer androids but it does still work. If it doesn't show up in the google play store, use the above link to download.

Use either google maps ore google earth.

Build Specs:
Mini Size SPDT Slide Switch: https://a.co/d/4jY7RHN
1s Lipo around 500mAh (battery should be under L 40mm x W 8mm x H 12mm) I recommend https://shorturl.at/X7Pus
2-56 screws for securing switch.

Obviously due to the nature of the hobby, this isn't a completely turn key setup ready to go. you will need to tweak/modify to work for you. The rear cover is friction fitted.

There are 3 covers.
1 has a port for the switch and for a JST Losi 2.0 connector for charging https://a.co/d/bRDDWgM

1 has the switch opening only

1 is completely blank for your own customization.

Sketchup files included, so if you can use that program, you can modify how you want.