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If you want maximum range and sensitivity, don't use tone squelch at all... but be prepared for interference. CTCSS is the original tone squelch system designed by Motorola, and trademarked as "Private Line" or "PL" tone. Everyone else copied it. DCS or "DPL" and Motorola calls it, is an improvement over the original, with more codes, and less false-triggering on receivers. If you are just wanting to talk to your own group, and not get outside chatter, I would go with DCS, and pick a 3 digit code that means something to you so you can remember it. It can't be just any 3 digits, it must be a valid code in the drop-down list of CHIRP, or in the programming functions of the radio. Make sure all radios are set to the same channel, and that they all have the same DCS code programmed in for TX and RX, and you'll be good to go with minimal interruptions or interference.

Hi Fred, I have not used chirp with our V1's because we don't have a lot of need for programming many tones. I would normally use CHIRP for programming receive only frequencies that one might want to monitor such as NOAA weather, protective services, etc. The V1 has the tone burst for transmitting and is used in Europe because some repeaters require the 1750 Hz tone burst. Most users in the U.S. would choose either CTCSS or DCS. Coming from a long time ham radio background, I tend to use CTCSS tones, but you could use DCS as an alternative. Perhaps someone else can point out whether they have experienced better results with one selective calling system over the other. BTech has a good video that may help if you have not seen it: https://www.youtube.com/watch?v=CrG0El1KkIM It walks you through the menu options.