Thanks! I've been into submarine sims since I was a kid and my dad showed me Silent Service 2. Later I got into Silent Hunter 4 and I started thinking that it would be fun one day to distill the core tactical stuff to just a simple map (so that you could practice the geometry stuff of approaching ships with uncertain data).

That idea bounced around in my head for ages until I decided back in February to give it a shot and make a prototype. It turned out that the prototype was a lot of fun so I kept going :)