 are the way to go.
Gear which supports your mapping in the field
See Field Gear – A list of ideas for personal & vehicle gear to carry with you in the field
Main article: Long journeys
In some cases, you may be away from a computer for an extended period, and the number of trackpoints your GPS holds can become a severely limiting factor. You may need to increase the interval between trackpoints, consider using a different model of GPS, and plan ahead for extra battery capacity.
In general you should keep your traveling to public rights of way, although there can be some exceptions (such as an access road into a camp site for example). Use your common sense, if a driveway is labelled 'No Trespassing' then respect the sign and do not enter.
When taking photographs which will later be made public, treat the property as you'd expect yours to be treated. Intrusive photographs are not needed in order to map the streets, you might question whether street number signs are 'fair game' – in rural areas these can be useful as they may be the only way to confirm the name of the public road leading to the property/address.
There's also a page for more detailed analysis of restrictions on photography and national differences.
Physically Securing Your Device
If traveling with a lot of gear and/or when there's a risk of dropping/losing your GPS unit, it's good to rig up your GPS so it attaches to you. Here's an example photo. Just attach beaner to a secure d-ring or loop on your belt/vest/pack etc. Attaching bright colour flagging ribbon is very helpful to find the device if you do drop it in a place where it blends into the terrain like in forested regions. (This setup also works great for other types of gear as well ie. field book, compass, range finder etc.)
An alternative useful for winter sports is to insert the device into the loop in the strap of your goggles (as shown in the second photo). The device should be sufficiently secured, has a good reception and you have both hands free. For additional security, a cord with a beaner, attached to your clothes, is still a good idea.
(In case you find skiing goggles uncomfortable on a sunny day, there are some lighter goggles with better ventilation which, however, still have a head strap as shown in the picture.)