Earlier this week, portable media player maker Archos announced that is to start selling its first GPS satellite navigation devices from late May.

There were a few critical gaps in what was announced, however, so we asked Archos to clear up just how the device works. This morning, product manager Steve Martin called us to clarify things.

As with any standard portable satellite navigation device, the Archos 605 WiFi portable media player sits in its cradle and attaches to the windscreen using a sucker. The cradle - which can be bought separately or as part of a £299 PMP and GPS unit bundle - houses the GPS antenna and Sirf Star III chipset. It also has its own speaker.

Customers buying the 30GB Archos 605 WiFi with GPS unit as a bundle will find the necessary maps preinstalled on their PMP. Bought this way, you get maps covering the whole of western Europe - some 22 countries in total.

However, if you already own an Archos 605 WiFi media player of any capacity, you will be able to buy the GPS cradle as an accessory for £99 including VAT. In this case, you need to load the player with maps manually. The Tele Atlas maps are supplied on a DVD and need to be transferred from PC to the player via the USB cable Archos supplies.

Initially, Archos will only offer maps of the UK and Ireland to customers buying the GPS cradle accessory separately from the PMP, though it plans to offer full 22-country western Europe maps in this way at a later date.

Martin says pricing for this latter option has yet to be announced, while the UK and Ireland bundle will set customers back £99.

Archos 605 WiFi players of any capacity support the new GPS module and cradle

Archos 605 WiFi players of any capacity support the new GPS module and cradle

Click here for our review of the Archos 605 WiFi portable media player.