The Systematic Maps website provides some great Ordnance Survey maps. At the top of each page is a list of buttons. Clicking the Full button allows you to see a fullscreen OS map.

Links to Ordnance Survey maps, centred on the Avon Tyrell campsite:
1:50k map
1:25k map

There are lots of other maps available but here are some recommended ones:

A Google Map of the venue and surrounding area which will also give you directions.

The Ordnance Survey 1:25 000 sheet 22 New Forest Leisure Map and Ordnance Survey 1:50 000 Landranger Series Nos. 195 & 196. Available from the Ordnance Survey website. See above for online links as well.

The Forestry Commission’s New Forest Cycling page lists maps and information including the New Forest Cycle Map which is also available in hard copy form via various outlets for a small charge.

All riders must adhere to the Forestry Commissions ‘New Forest Cycle Code’ when cycling in the New Forest. A free online copy of the New Forest Cycle Code is available, hard copies are also available from the Forestry Commission, Tourist Information Offices and local outlets for a small charge.