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Thanks for the clarification. Of course, if you're not a SDI instructor you can't teach an SDI course. I've seen a PADI shop issue NAUI (and others from time to time) certifications with the appropriate instructor, but the context was a shop with a lot of traffic (at least for the area) and...

Several thoughts: 1. Insurance is likely irrelevant. You're paying one policy as an instructor, not likely two because you have two cards. Either it's on you or it's on the shop, and that'll be agency-independent. 2. I think Tursiops had great advice: Look at what shops are certifying in...

I like to think of it as "horizontal viz integrated over a vertical gradient." :wink:

Secchi disks are an old favorite, but the results can be highly variable from user to user. You tend to see it deeper with more experience....

That could work if you took measurements at a few different depths. You can then find the "coefficient of extinction" which tells you how turbid the water is. The basic equation is Iz=Io*e**(-kz) Iz=light intensity at depth z (you measure this with your light meter) Io=light intensity at the...

I do have experience, but not with a handheld unit. What I'll say is that they're pretty worthless for leaving deployed to collect data. Some random bit of debris gets into the gap between light source and sensor and you get low viz from that point on. At least from the gauges perspective...

It can be a lot of fun. Creatures come out at night that hide in the day, including octopus, crab, shrimp, etc.. Where I live, seals often accompany night divers and use the light to hunt prey that hides during the day. I had a student who had serious anxiety issues about diving (for good...

That's how you should do nav. Well, at least compass navigation. The elements you learn are things like this: 1. How many kick cycles does it take you to go 100'/30 m? 2. Starting at a fixed point (maybe the instructor?) you swim out and back using a compass. 3. Starting at a fixed...

What's the abbreviation to go from true to compass? Something like TVMDC? True, Variation, Magnetic, Deviation, Compass? And as long as I'm on a tangent, I had friends who worked on Devon Island in the late 1980's. In the 1920's a compass on Devon would have pointed SW. By the time they...

Not sure outside the USA, but DAN in the USA can be evaluated using Charity Navigator. Here's a link: https://www.charitynavigator.org/ein/561696689

Can't speak for DAN Europe, however consider my employer is not an insurance company but our Human Resources Department has tabs labelled insurance on their web site. Insurance is a little like the shipping industry. Somebody owns the vessel, and leases it to somebody else, who hires a third...

Experience is a strange thing. Doing the same dive 100 times is not the same as diving 100 times in multiple locations, with different goals, and with different groups of people. In my neck of the woods you could dive a half dozen popular sites for a total of 100 dives, then try a different...

Got a source for that? I'm genuinely curious. I tried searching the Instructor Manual. Unfortunately my Guide to Teaching is not where I can get it right now. I've heard (no source) that 3 years is the legal liability cutoff in most situations in my area. There's an exception for minor...

By 2001 PADI, NAUI, and YMCA (and likely others I'm not familiar with) had digitized all records. Even in the days of paper records, the paper was collected at the agency headquarters. It wasn't just kept in the local shop. As for a more sympathetic look at The Whaler: If their shop burned...

You did fine on the gear. I dove a Ranger for 20 years, and it's improved since then. I'm in the "not a fan of the ripcord system" personally, but that's one of those cases where everybody's different and nobody's really wrong. Other than the ripcord, there's nothing about the Ranger I didn't...

I think the key for me is "can I get it serviced where I dive?" Sure, you can mail your regulator to a servicer. In your case, there'll be somebody in the USA that services any reg just about. However, when it's just got a minor free flow that comes and goes and doesn't need an overhaul, my...

There seems to be an assumption here that you certified through PADI. Do you recall if that was true? There are multiple dive agencies out there, though PADI certifies the majority of divers. If it's PADI and you can't find it, you could message me with your name and date of birth and I...

Are the currents in the strait wind-driven primarily? (I understand in other tropical locations they are.) Or tidal? Thankfully for me our currents are primarily tidal and thus at least somewhat predictable. The two hairy situations I've gotten into in my home waters were due to my own...

Per Wikipedia: "Boylan is free on $75,000 bond, with sentencing scheduled for May 2, 2024."

Strobes will give you better distance, but all lights fail at longer distances. (Note sports photographers never use flashes....) I know a lot of people love red filters, but I'm not a huge fan. I'd rather add red back in after the fact. If there is zero red light (I've seen it), a red...