How many times can I install the app (or use it on other devices)?
You can use the app on up to three devices with a single account and single subscription, regardless of whether this is Apple, Android or Windows. You can download the Windows software here.
How to remove devices
If you click on ‘Profile’ in the bottom right of the app menu, and then on ‘Devices’ (which you will find under ‘ACCOUNT’), you will see a list of the devices used on your account. By clicking on the name of a device, you can then remove it to free up space and use the Nautical Maps app with another device.
See also: How do I sign in with a second device?