Check if your device is compatible with the VHF firmware from the PRM80 band code list
You can modify or add channels using a computer
The default VHF channel list for 2m operations is :
Channel	Name	RX frequency	Shift
0	R0	145,600	-
1	R0X	145,6125	-
2	R1	145,625	-
3	R1X	145,6375	-
4	R2	145,650	-
5	R2X	145,6625	-
6	R3	145,675	-
7	R3X	145,6875	-
8	R4	145,700	-
9	R4X	145,7125	-
10	R5	145,725	-
11	R5X	145,7375	-
12	R6	145,750	-
13	R6X	145,7625	-
14	R7	145,775	-
15	R7X	145,7875	-
16	S8	145,200	
17	S8X	145,2125	
18	S9	145,225	
19	S9X	145,2375	
20	S10	145,250	
21	S10X	145,2625	
22	S11	145,275	
23	S11X	145,2875	
24	S12	145,300	
25	S12X	145,3125	
26	S13	145,325	
27	S13X	145,3375	
28	S14	145,350	
29	S14X	145,3625	
30	S15	145,375	
31	S15X	145,3875	
32	S16	145,400	
33	S16X	145,4125	
34	S17	145,425	
35	S17X	145,4375	
36	S18	145,450	
37	S18X	145,4625	
38	S19	145,475	
39	S19X	145,4875	
40	S20	145,500	
41	S20X	145,5125	
42	S21	145,525	
43	S21X	145,5375	
44	S22	145,550	
45	S22X	145,5625	
46	S23	145,575	
47	S23X	145,5875	
48	SSTV	144,500	
49	APRS	144,800	
50	R0 In	145,000	
51	R0X In	145,0125	
52	R1 In	145,025	
53	R1X In	145,0375	
54	R2 In	145,050	
55	R2X In	145,0625	
56	R3 In	145,075	
57	R3X In	145,0875	
58	R4 In	145,100	
59	R4X In	145,1125	
60	R5 In	145,125	
61	R5X In	145,1375	
62	R6 In	145,150	
63	R6X In	145,1625	
64	R7 In	145,175	
65	R7X In	145,1875