Hi, interesting topic. As a diver based in SE Asia let me put my two cents worth in....
I also use a SM configuration. It's a Helix Sidemount, designed and assembled in Singapore. It's worldwide launch is at ADEX in Singapore next month. I'm not plugging it so please don't get the wrong idea but let me state that I am a co-designer and it's a SM for recreational divers upgradable for Tek.
We tested Helix extensively in Singapore, Malaysia, Thailand, Indonesia and Philippines waters. The OP is right to ask if SM is 'accepted' in SE Asia. Out of the numerous dive trips with different 'charters' we only had one issue where a dive operator questioned what we were doing to the extent where a long-ish 'conversation' was required. Most of the time it's a look of curiosity but one flick of the SDI SM C-card was enough to allay any concerns. On some dives we didn't even need to show our C-cards. All of our dives were recreational.
My advice is to either not say a word and rig up and go OR politely mention that you will be using a SM configuration. If there are any questions asked you can simply tell them you will show them before you get in the water. You will find that after the first dive most of the people on the boat will want to talk to you about SM diving. As for twin tanks it's generally not a problem to start with both and dive with the same two again but you must inform the crew you are doing this as on many boats their procedure is to switch and refill tanks during your surface interval. It's courtesy to inform them and also saves you being charged double.
As for passing up tanks at the end of the dive, it should never be an issue in SE Asia. All boat crews are on hand to aid divers back up on to the boat after a dive. Do not feel you are putting them out. It's entirely normal and I've seen several instances of tired divers handing their standard BM BCD's to the crew before climbing up the steps/ladder.
So please go ahead and travel with your SM. It's one of the advantages of using a SM configuration. Happy diving!
I also use a SM configuration. It's a Helix Sidemount, designed and assembled in Singapore. It's worldwide launch is at ADEX in Singapore next month. I'm not plugging it so please don't get the wrong idea but let me state that I am a co-designer and it's a SM for recreational divers upgradable for Tek.
We tested Helix extensively in Singapore, Malaysia, Thailand, Indonesia and Philippines waters. The OP is right to ask if SM is 'accepted' in SE Asia. Out of the numerous dive trips with different 'charters' we only had one issue where a dive operator questioned what we were doing to the extent where a long-ish 'conversation' was required. Most of the time it's a look of curiosity but one flick of the SDI SM C-card was enough to allay any concerns. On some dives we didn't even need to show our C-cards. All of our dives were recreational.
My advice is to either not say a word and rig up and go OR politely mention that you will be using a SM configuration. If there are any questions asked you can simply tell them you will show them before you get in the water. You will find that after the first dive most of the people on the boat will want to talk to you about SM diving. As for twin tanks it's generally not a problem to start with both and dive with the same two again but you must inform the crew you are doing this as on many boats their procedure is to switch and refill tanks during your surface interval. It's courtesy to inform them and also saves you being charged double.
As for passing up tanks at the end of the dive, it should never be an issue in SE Asia. All boat crews are on hand to aid divers back up on to the boat after a dive. Do not feel you are putting them out. It's entirely normal and I've seen several instances of tired divers handing their standard BM BCD's to the crew before climbing up the steps/ladder.
So please go ahead and travel with your SM. It's one of the advantages of using a SM configuration. Happy diving!