Mother of a Type 1 daughter, 15 now, diagnosed at 11. We have taken 3 cruises on Celebrity and Holland America since her diagnosis. We have a Dexcom and we do MDI (so no pump). The Dexcom G5 relies on data and wifi to share information to the cloud where you can see it on your phone. I have a feeling that data won't be a)available and/or b)reliable. I only get cell service when I am on U.S. islands - not when we're out to sea. When you're at sea, it's cellular at sea ($$$$$$$). We have a G4 (with a receiver), so no sharing here yet. The G5 is just coming to Canada now.
As far as the kids club, I wouldn't rely on them to even check. My kids never wanted to go to the kids club - they just wanted to hang with us at the pool or wherever, so I have never had this particular problem. I wouldn't leave him in the kids club for any length of time and never when I've just guessed at insulin or he has any chance of going low. Defininitely not for the morning or afternoon.
As far as sailing with diabetes, I always made sure my DD's blood sugar was higher than normal. I kept her that way intentionally. Our endo said "don't worry, you're on vacation, it's only a week. When you get back home, get back on track." I know as a T1D parent, you always want to keep your child in a good range, but letting them run higher than normal for safety I think is just wise. Also, keep in mind that everything they eat is a guesstimate. We are pretty good at carb counting and I never fail to underestimate the amount of walking or swimming she's done and she heads low once or twice (thankfully, we have the CGM). You don't want to run them so high they develop ketones, but keeping them under 14mmol (250) is a safe bet, and bring them down for the night and keep them steady.
- As far as packing, I bring 3x the insulin we need and just keep it on a shelf in the room. It won't go bad for 28 days or more. Don't use the fridge - they freeze stuff.
- I bring glucagon, extra tape for sensors and extra sensors.
- Of course you'd bring all your pump infusion sets, batteries, dexcom cables etc.
- I bring waterproof bags in case we're near the beach for things we don't want wet.
- I bring Frio coolers for insulin if we're in a warm place and we don't want insulin and insulin pens to get too hot.
- Make sure nothing gets x-rayed that shouldn't. When you come back to the ship, they x-ray your bags - make sure child and equipment don't go through the x-ray
- I bring the Calorie King food book to help me estimate carbs for unfamiliar foods
- I get good travel insurance in the event of an emergency situation
- I have lots of glucose tabs, juice boxes, protein snacks etc. in the cabin fridge in case I need them at night.
I hope this has helped out a bit. Good luck and enjoy your cruise.