SOLAS CHAPTER IV

RADIOCOMMUNICATIONS

PART A - GENERAL
1 Application 
2 Terms and definitions 
3 Exemptions 
4 Functional requirements 

PART B - UNDERTAKINGS BY CONTRACTING GOVERNMENTS
5 Provision of radiocommunication services 
5-1 Global Maritime Distres and Safety System identities

PART C - SHIP REQUIREMENTS
6 Radio installations
7 Radio equipment - General
8 Radio equipment - Sea area Al
9 Radio equipment - Sea areas Al and A2
10 Radio equipment - Sea areas Al, A2 and A3
11 Radio equipment - Sea areas Al, A2, A3 and A4 
12 Watches
13 Sources of energy
14 Performance standards
15 Maintenance requirements
16 Radio personnel
17 Radio records
18 Position-updating