A friend passed on this neat little trick to put your name and contact details on the opening screen of a Garmin Edge. Surprisingly I could find no reference to it in the instruction booklet but it works and at least gives you an outside chance of having it returned should you lose it. It worked on my 800 and 705 and should work on any unit with a startup.txt file. ****Update, It also works on eTrex20 ******
Edit 22/5/2017 also works on Garmin 1000
To set up the screen you need to plug you Edge or eTrex20 into your laptop, screenshots are from my Mac but I am sure it is the same for a Windows system.
Highlight your Garmin in Finder, and then open the “Garmin” folder and then open the “Start up Text”
This screen pops up, first you need to set how long to display the message, I went for 10 seconds and then type your contact details on the next line as instructed.
Save the file, unplug your Garmin and turn it on. Job done, open the beer…..