The CoCoLogBook has no limits for 30 days.  You can download it to your iPad and or iPhone together with multiple other partners or crew devices.  After the trial period you will only be able to view the data.  

In the starter solution we have included some sample data from our ARC regatta so that you can have the right feel for the LogBook.  Delete and add items as you please. 

The Logbook is local on the device and does not use celluar data if not syncing.  We recomend to download the starter solution while on WiFi and also use the initial sync when connection to a WiFi network.  The sync and backup only copies the changes to the database so the data transfer is limited.