To update your chart and continue with online updates at the end of the twelve month period a Navionics Updates card (blank or pre-loaded with a chart area) can be purchased for around half the price of a Navionics+ card. The charts can be updated online as often as required during the twelve months following online registration at. These chart cards include navigation detail as with previous Gold charts and also the option of SonarChart™ and Community Edits. Navionics+ pre-loaded chart cards replace Gold charts.