Repeater-START, the only open-source offline repeaters mapping app, is available on Github, and Sourceforge. A working Android phone port is also available.
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Repeaters in grid square EN21CJ

This is a listing of repeaters in this grid square.
You can read more about Maidenhead locator/grid squares here from the ARRL website.
If you find one of your local repeaters to be missing, please add it to the list.

Repeater Callsign Frequency Offset Encode Decode Nearest City Restriction (if any)
AB0VX 444.8Mhz 5Mhz 97.4 97.4 Honey Creek, IA USA Favorite
AB0VX 145.41Mhz -0.6Mhz 97.4 97.4 Honey Creek, IA USA Favorite
AB0VX 446.875Mhz 0Mhz 97.4 97.4 Honey Creek - Portable Node, IA USA Favorite
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