Furuno FM-2710 - Manual (Page 19)

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3. Operation
3-1. Controls and Indications
1 Volume control
(Power on/off)
2 Channel selector
3 Squelch control
4 [16] Key
5 [9/ALL] Key
6 [INT] Key
7 [1/25]/DIM Key
8 [WX] Key
9 [DW] Key
10 [PTT] Switch
Fig. 3-1 Controls