In order to not hold up delivery of your order, we fill and ship Domestic (US) orders on a partial shipment basis when the main items (ie GPS receivers) are in stock. If additionally ordered items (ie accessories) are not in stock at the time of shipment, they will be placed on backorder, and sent out to you by regular mail (at our cost) as we receive them. If you prefer your shipment to wait until it is complete, you must advise us to place your order on a 'SHIP COMPLETE' status, and we will not ship it until all items are available. All Canadian and International orders are shipped only when the order is complete (ie. no partial shipments).