In the Cruiser app we have in-apps for "1 month navigation" or "1 year navigation". These in-apps are handled as a subscription. If you want to cancel them because of a product change or "Unlimited navigation" you can do this in your Apple account.

Attention: Apple is responsible for the administration of subscriptions. If you have questions or problems regarding a subscription please contact Google directly.   

Subscriptions work separate from each other and are not canceled automatically if you order other subscriptions. This has to be done manually:
  1. Go to Settings > iTunes & App Store.
  2. Tap on your Apple ID.
  3. Tap then on View Apple ID. Maybe you have to log in or use Touch ID. 
  4. Scroll down and tap on Subscriptions.
  5. Tap on the subscription you want to manage or cancel.

In the following link you'll find a detailed instruction how to cancel a subscription:

View, change or cancel a subscription