These database waypoints are discussed in the chapter on databases. On most unit they must be no more than 6 characters long and contain no spaces but can contain any combination of letters and numbers and some punctuation.
The newest units permits 10 character names and these can include spaces.
On some units it will automatically use the lowest available number but and on many others you can force the number sequence to continue from wherever you wish.
To do this just name a waypoint from the number sequence.
On the G-III family and emap you first save the waypoint and then you can average by selecting this option from the local menu on the waypoint display screen.
(Please see more information on averaging below.) If you are using dgps you can still average the position but the improvement will be much less since dgps is already more accurate.
A unique default name is assigned automatically but you can modify this name at your leisure without effecting the position data.
While averaging is going on the unit will display a FOM, figure of merit, number to indicate the probable accuracy of the average to this point.
These names are three digit numbers starting with 001 and incrementing each time you create a new waypoint.
Even if you rename a waypoint the unit will generally assign the next number in the sequence anyway and will not reuse the numbers until it reaches 999.
You simply hit the MARK key, on the G-III, etrex, 76, and emap press and hold the ENTER key, and the waypoint entry form will appear.
The location you were at the moment you pressed the button is already saved in the waypoint information on the form so even if you are traveling at 65 miles per hour down the freeway you can reliably capture a single point with the press of the button.