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Rescue is the only requirement for the PADI DM course (other than AOW of course, a certain number of logged dives--40 I think to begin the DM course-- and EFR (or CPR/ First Aid equivalent accepted by PADI &/or your LDS- it is a requirement for Rescue anyway). No other specialties are required to take DM. Rescue is not considered a Specialty course. But most say it is the most important course and all should take it. I have read/heard that courses vary quite a bit according to instructor.
The only real benefit of doing full specialties is IMO getting training in something you want to do while diving. Like taking the Underwater Nav course if you plan to do a lot of checking out specific sites during one dive and not get lost.
I have 7 specialties from years ago and don't make use of much of the training I got, not that it wasn't a good education. I had more money then so I collected some cards--what the heck.
The only real benefit of doing full specialties is IMO getting training in something you want to do while diving. Like taking the Underwater Nav course if you plan to do a lot of checking out specific sites during one dive and not get lost.
I have 7 specialties from years ago and don't make use of much of the training I got, not that it wasn't a good education. I had more money then so I collected some cards--what the heck.