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 FN42JJ

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)
KB1GXW 223.86Mhz -1.6Mhz 100.0 100.0 Boston, MA USA Favorite
KC1CLA 145.43Mhz -0.6Mhz 146.2 Belmont, MA Favorite
W1MHL 146.64Mhz -0.6Mhz NAC293/136.5 Waltham, MA Favorite
KB1FX 223.86Mhz -1.6Mhz 100 Belmont, MA Favorite
W1MHL 224.94Mhz -1.6Mhz Waltham, MA Favorite
W1MHL 449.075Mhz -5Mhz 88.5 88.5* Waltham, MA Favorite
W1MHL 927.1375Mhz -25Mhz 131.8 100 Waltham, MA Favorite
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