The Mares Icon HD Nitrox Dive Computer, launched late last year, allows you to download your dive site maps into the wrist unit so they are available to you during the dive. Using the unit’s integrated interface you can either download your own site maps or visit the Mares web site and select maps to download from there. The unit is rechargeable so you need never worry about where to buy batteries again. Just make sure it’s charged before you set off for your day diving.