Magellan MobileMapper 6 GPS – Part 2

Continued from part 1 of the MobileMapper instructions. We assume you did set up the MobileMapper as described there.

The following is a quick guide on using the Mopbilemapper 6 in the field. For detailed instructions see the MobileMapper 6 manuals from pro.magellangps.com.

Load your map

Once you are in the field, switch the MobileMapper on and start the Mobile Mapping Software. It will automatically load the latest map. Tap Menu > Layers. On top it displays the name of the currently loaded map (e.g. karl300609.map). If this is not your map, close the Layers screen and load yours from Menu > Open.

Check the display

Fig.1: MobileMapper 6 main screen
Fig.1: MobileMapper 6 main screen

Wait a minute to allow the MobileMapper to calculate it’s location. It then should look somewhat like Fig.1, showing these items:

  • A black arrow in the map display, indicating your location. It points in the direction that you were last moving. If there is no arrow it might be off screen. Press the ESC key (on the casing below the metal wheel) to center the map on your location.
  • A scale bar.
  • In the bottom bar: X and Y of your location, in the coordinate system of your map.
  • In the top bar:
    • a satellite symbol and the number of satellites currently used
    • an EPE value (Estimated Positional Error)
    • “SBAS”, indicating that a Satellite Based Augmentation is being used
    • “REC”, indicating that the receiver is logging raw data for post-processing.

All of these items need to be present and show plausible values to guarantee accurate mapping results.

Navigate the map display

  • Pan: drag the screen with the stylus or press the rim of the metal wheel
  • Center: press the ESC key (below the metal wheel) to center screen on your current position.
  • Zoom in/out: tap Menu > Zoom In / Zoom Out

Logging new data

  1. Go to the location where you want to collect a feature (a sample site, the beginning of a road, a corner of a field, etc.)
  2. Tap Log or press the LOG key. A menu appears listing all the layers in the map. (If the map only contained a single layer, no layers would be displayed and Mobile Mapping would immediately start logging at this point.)
  3. Tap on the layer name for which you want to log a feature (e.g. samplesites).
    • If you are logging into a point layer, Mobile Mapping instantly starts logging the point. Wait for the end of the averaging process while holding the receiver still.
    • If you are logging into a line layer, Mobile Mapping instantly starts logging the line. Walk along the line. You will see a line being drawn on the screen as you walk. If you need to pause logging, e.g. to take notes, use Log>Pause, take your notes, then continue with Log>Resume. When you arrive at the end of the line, tap Log > Stop.
    • If you are logging into a polygon layer, Mobile Mapping instantly starts logging the polygon.  Walk along the polygon. You will see a line being drawn on the screen as you walk. If you need to pause logging, e.g. to take notes, use Log>Pause, take your notes, then continue with Log>Resume. When you arrive at the end of the polygon (i.e. your starting point), tap Log > Stop. NOTE: You do not need to go back to exactly the start point. Wherever you are when you select Stop, Mobile Mapping will automatically complete the polygon by drawing a
      straight line from the current position to the starting point
      of the polygon.
  4. After logging the point/line/polygon, Mobile Mapping automatically switches to the attribute list.
  5. Add attribute data.
  6. Tap OK to return to the map screen, which now shows the feature you just logged.

Continue logging additional features.

Revisiting existing data

Navigating to a feature:

  1. Tap Menu > Go To…. A list of features is displayed. Features are listed from the nearest to the farthest from your current location.
  2. In the Go to dropdown, choose a layer, e.g. samplesites. The screen then lists all the features contained in that layer.
  3. Tap on the name of the feature you want to go to. This takes you back to the map screen where you can now see a yellow/red segment connecting your current position to the feature. In the lower bar, you can read the distance and the bearing to the feature.
  4. Walk in the direction indicated on the screen until you reach the feature.

Editing attributes

  1. In the map screen tap and hold on the symbol for the feature (e.g. a sample site) you want to edit.
  2. When you see a bold orange line surrounding the feature, release the stylus. The program then displays the list of attributes pertaining to the feature.
  3. Edit the attributes that need changes and then tap ok.

Searching for a feature

Let’s say you have a sample site named ‘Site D’, and you don’t know which one it is.

  1. Tap Menu>Find… The screen then displays one of the layers and the names of its attributes.
  2. In the Find field, select the desired layer type. e.g. Point. Optionally, tap on attributes and enter search criteria, e.g. tap the attribute name and enter Site D.
  3. Tap on the Find button to start the search. You get a list all of the features in the map which meet the search requirements. From this list select the desired feature and see where this feature is located on the map screen. In addition, by selecting Menu>Go To…, you can navigate to this feature.

Finishing

Exit the mapping software with Menu > Exit (not with the X symbol, this only minimizes the software).

Back in the office

See Magellan MobileMapper 6 GPS – Part 3 for instructions on transferring your data back to a PC and (optionally) improving the accuracy of your GPS readings through post-processing.

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