Garmin GPS 152H User manual

PRELIMINARY
GPS 152H
owner’s manual

© 2010 Garmin Ltd. or its subsidiaries
Garmin International, Inc.
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st
Street,
Olathe, Kansas 66062, USA
Tel. [phone] or [phone]
Fax [phone]
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Tel. [phone] (outside the UK)
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Garmin Corporation
No. 68, Jangshu 2
nd
Road,
Sijhih, Taipei County, Taiwan
Tel. [phone]
Fax [phone]
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GPS 152H Owner’s Manual i
Introduction
 Warning
See the Important Safety and Product Information guide in the
product box for product warnings and other important information.
This manual includes information for the GPS 152H.
Tips and Shortcuts
Press Page to return to a main page from a submenu page.
Continue to press Page to scroll through the main pages.
Press Menu from any of the main screens to access advanced
settings. Press Menu twice to display the Settings Menu.
Press and release the Power key to adjust the display settings.
Manual Conventions
In this manual, when you are instructed to select an item, you should
highlight the item, and press Enter. When small arrows (>) appear
in the text, they indicate that you should highlight a series of items
on the screen using the Rocker, and press the Enter key after each
item. For example, if you see, “Select Trk > Record Mode,” you
should:
1. Use the Rocker to highlight Trk. Press Enter.
2. Use the Rocker to highlight Record Mode. Press Enter.
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Product Registration
Help us better support you by completing our online registration
today. Go to http://my.garmin.com. Keep the original sales receipt,
or a photocopy, in a safe place.
Contact Garmin
Contact Garmin Product Support if you have any questions while
using your unit. In the USA, go to www.garmin.com/support, or
contact Garmin USA by phone at [phone] or [phone].
In the UK, contact Garmin (Europe) Ltd. by phone at 0808 2380000.
In Europe, go to www.garmin.com/support and click Contact
Support for in-country support information, or contact Garmin
(Europe) Ltd. by phone at +44 (0) 870.8501241.

ii GPS 152H Owner’s Manual
Table of Contents
Introduction...........................................................................i
Tips and Shortcuts ........................................................................ i
Manual Conventions ..................................................................... i
Product Registration ..................................................................... i
Contact Garmin............................................................................. i
Getting Started.....................................................................1
Using the Keypad......................................................................... 1
Turning the Unit On or Off............................................................ 2
Acquiring GPS Satellite Signals................................................... 2
Adjusting the Backlight and the Contrast ..................................... 2
Entering Text in a Field ................................................................ 2
Navigation ............................................................................3
Main Pages .................................................................................. 3
Creating Waypoints...................................................................... 3
Navigating to a Destination .......................................................... 5
Creating, Navigating, and Editing Routes .................................... 6
Using Tracks ................................................................................ 8
Settings ..............................................................................10
Customizing the Main Pages ..................................................... 10
Using the Settings Menu.............................................................11
Appendix ............................................................................20
Specications............................................................................. 20
Alarms and Messages ............................................................... 21
Using Simulator Mode................................................................ 23
Viewing System Information ...................................................... 23
Restoring the Original Factory Settings ..................................... 23
NMEA 0183................................................................................ 23
Caring for the Unit...................................................................... 24
Software License Agreement ..................................................... 24
Index ...................................................................................25

GPS 152H Owner’s Manual 1
Getting Started
Getting Started
Power/
Backlight
Menu
Page
NAV/MOB
Enter/
Mark
Zoom
Out
Zoom
In
Quit
Rocker
Internal
Antenna
Using the Keypad
Power/Backlight—Press and hold to turn the unit on or off; press
and release to adjust the backlight and day and night modes.
Rocker—Press up, down, left, or right to move through menus,
highlight elds, and enter data.
Enter/Mark—Press to select a highlighted item or mark a
waypoint.
Menu—Press to access additional settings and conguration
options. Press twice to display the Settings menu.
Page—Press to cycle through the home pages.
NAV/MOB—Press and release to display the Navigation menu.
Press and hold to navigate to a man overboard (MOB) location.
Quit—Press to return to the previous page. Press when entering data
to cancel the action and restore the previous value.
Zoom Out—Press to zoom out.
Zoom In—Press to zoom in.

2 GPS 152H Owner’s Manual
Getting Started
Turning the Unit On or Off
To turn on the unit, press and release the Power key. When the
Warning screen appears, press Enter.
To turn off the unit, press and hold the Power key.
Acquiring GPS Satellite Signals
When you turn on the GPS 152H, it must collect satellite data
and establish the current location. When the unit acquires satellite
signals, the signal strength bars momentarily appear on the Satellites
page. When the unit loses satellite signals, the bars disappear and the
position icon displays a ashing question mark.
For more information about GPS, visit the Garmin Web site at
www.garmin.com/aboutGPS.
Adjusting the Backlight and the Contrast
1. Press and release the Power key.
2. Use the Rocker to adjust the light and the contrast.
To cycle the backlight from your adjusted setting to Off, and to
maximum setting, continue to press and release the Power key.
Entering Text in a Field
1. Use the Rocker to highlight the eld you want to change. Press
Enter.
2. Press the left arrow on the Rocker to clear the eld.
3. Press the up and down arrows on the Rocker until the desired
character appears. Press Enter.
4. Press the right arrow on the Rocker to enter the next character.
5. Repeat steps 3 and 4 until the text is complete.
6. Press Enter.
Use the Rocker to highlight other elds on the same screen.

GPS 152H Owner’s Manual 3
Navigation
Navigation
Main Pages
The GPS 152H has ve Main pages.
To cycle through the Main pages, press Page.
Map Page Highway PageCompass Page
Active Route Page Numbers Page
Creating Waypoints
Waypoints are locations you record and store in the GPS 152H. You
can store up to 3,000 waypoints with a user-dened symbol, name,
and depth for each waypoint.
Marking Your Present Location as a Waypoint:
1. From any Main page, press and hold ENTER/MARK until the
New Waypoint screen appears.
2. To change the default symbol, name, or depth of the waypoint,
use the Rocker to highlight the eld you want to change. Enter
text as described on page 2.
3. Select OK to save the waypoint.
Creating a Waypoint by Entering Grid Coordinates
1. From any Main page, press Menu twice.
2. Highlight Wpt, and press Menu.
3. Select New Waypoint.
4. Use the Rocker to highlight the coordinates eld.
5. To change the default symbol, name, or depth of the waypoint,
use the Rocker to highlight the eld you want to change. Enter
text as described on page 2.
6. Select OK to save the waypoint.
Creating a Waypoint While on the Map Page
1. From the Map page, use the Rocker to move the pointer ( ) to
the location where you want to create a waypoint.
2. Press and hold Enter/Mark until the New Waypoint screen
appears.

4 GPS 152H Owner’s Manual
Navigation
3. To change the default symbol, name, or depth of the waypoint,
use the Rocker to highlight the eld you want to change. Enter
text as described on page 2.
4. Select OK to save the waypoint.
Editing a Waypoint on the Map Page
1. From the Map Page, use the Rocker to move the pointer ( ).
Highlight the waypoint you want to edit.
2. Press Enter.
3. Use the Rocker to edit text as described on page 2.
Editing a Waypoint from a List of Waypoints
1. From any Main page, press Menu twice.
2. Highlight Wpt.
3. Waypoints can be listed by name (alphabetically) or by distance
from your present location. Highlight By Name or Nearest.
4. Select the waypoint you want to edit.
5. Edit text as described on page 2.
Deleting a Waypoint
1. From any Main page, press Menu twice.
2. Highlight Wpt.
3. Highlight By Name or Nearest.
4. Select the waypoint you want to delete.
5. Select Delete > OK.
Creating Waypoint Proximity Alarms
You can dene an alarm radius around saved waypoints you want to
avoid.
1. From any Main page, press Menu twice.
2. Highlight Wpt.
3. Highlight Proximity.
4. Select the Proximity Alarm eld, and select On.
5. Select the rst empty waypoint eld.
6. Select the waypoint for which you want to dene an alarm radius.
7. Optionally, edit text as described on page 2 to change the
waypoint name or to change the symbol, and then select OK.
8. Select the distance eld, and enter the radius of the circle
around the waypoint to create an alarm when you approach the
waypoint.
To add additional proximity alarms, press Menu, select Add
Waypoint, and repeat steps 5 through 8.
To delete all proximity alarms:
1. From any Main page, press Menu twice.
2. Highlight Wpt.
3. Highlight Proximity.
4. Press Menu, and select Clear All > OK.

GPS 152H Owner’s Manual 5
Navigation
Navigating to a Destination
To navigate to a waypoint:
1. From any of the Main pages, press NAV/MOB.
2. Select Go To Waypoint.
3. Highlight By Name or Nearest.
4. Select the waypoint to which you want to navigate.
5. Select Go To. Use the Map page, the Compass page, the
Highway page, or the Numbers page to navigate to your
destination.
To navigate to a point on the map:
1. From the Map page, use the Rocker to move the pointer ( ) to
your destination.
2. Press NAV/MOB.
3. Select Go To Map Point. Use the Map page, the Compass page,
the Highway page, or the Numbers page to navigate to your
destination.
Map page—shows your location ( ), your destination (when
zoomed out far enough), a course line indicating the shortest path to
your destination, and any saved waypoints within the scale of your
map.
Map page
Data elds
Destination
Course line
Waypoint
Zoom scale
Compass page—contains a rotating compass ring that indicates
the bearing (course over ground) to your destination. If the pointer
points toward the top of the compass, you are traveling directly
toward your destination.
Compass page
Data elds
Direction you are
currently traveling
Bearing to
destination

6 GPS 152H Owner’s Manual
Navigation
Highway page—provides a 3D view with your location and the
course to your destination.
Highway page
(on course)
Data elds
Your location
Course to
destination
Zoom scale
The Highway page also indicates if you have veered off course.
Highway page
(off course)
Numbers page—displays one or four congurable data elds.
Numbers page
To display only one data eld, press Menu and select Big Numbers.
NOTE: To change which data elds are shown, see page 10.
To navigate to a man overboard (MOB) location:
1. From any of the Main pages, press and hold NAV/MOB.
2. Select Yes.
To stop navigating:
From any page, press NAV/MOB and select Stop Navigation.
Creating, Navigating, and Editing Routes
You can create up to 50 routes, with up to 30 waypoints per route.
Creating a Route from a List of Waypoints
1. From any Main page, press Menu twice.
2. Highlight Rte, and press Menu.
3. Select New Route.

GPS 152H Owner’s Manual 7
Navigation
4. Select the rst blank eld in the list of waypoints.
5. Select a waypoint from the By Name list or the Nearest list.
6. Select OK.
7. Continue to select waypoints until you have selected the last
point on the route.
8. Press Quit to save the route.
To begin navigating the route, press NAV/MOB and select the route.
Creating a Route on the Map Page
1. From the Active Route page, press Menu.
2. Select Create on Map.
3. Select the rst blank eld in the list of waypoints.
4. Move the pointer ( ) to the starting point of the route, and press
Enter.
5. Optionally, edit text as described on page 2 to name the waypoint
or to change the symbol, and then select OK.
6. Continue to create the route waypoints until the route is
complete.
7. Press Menu, and select Stop Editing Route.
8. Optionally, edit text as described on page 2 to name the route.
9. Press Quit to save the route.
To begin navigating a saved route:
1. Press NAV/MOB.
2. Select Follow Route.
3. Select the route you want to take, and then select Activate.
4. Use the Map page, Compass page, Highway page, Numbers
page (pages 5–6), or Active Route page to navigate the route.
While navigating a route, you can view the Active Route page,
which lists all the waypoints on the route.
Active Route page
Editing a Route
You can insert new waypoints, remove waypoints, and reverse
existing routes.
To insert a new waypoint on a route:
1. From any Main page, press Menu twice.
2. Highlight Rte.
3. Select the route you want to edit.

8 GPS 152H Owner’s Manual
Navigation
4. Highlight the waypoint that is before the waypoint you want to
add, and press Menu.
5. Select Insert Waypoint.
6. Select a waypoint from the By Name list or the Nearest list.
7. Select OK.
8. Continue to add waypoints, if necessary.
9. Press Quit to save the route.
To remove a waypoint on a route:
1. From any Main page, press Menu twice.
2. Highlight Rte.
3. Select the route you want to edit.
4. Highlight the waypoint you want to delete, and press Menu.
5. Select Remove Waypoint.
Note: The waypoint is removed from the route. It is not deleted.
To invert an existing route:
1. From any Main page, press Menu twice.
2. Highlight Rte.
3. Select the route you want to invert.
4. Highlight any waypoint, and press Menu.
5. Select Invert.
To delete a route:
1. From any Main page, press Menu twice.
2. Highlight Rte.
3. Highlight the route you want to delete, and press Menu.
4. Select Delete Route.
To delete all saved routes:
1. From any Main page, press Menu twice.
2. Highlight Rte, and press Menu.
3. Select Delete All.
Using Tracks
A track is a recording of your path. The track currently being
recorded is the active track. An active track can be saved. To adjust
track settings, see page 12.
Turning Tracks On or Off
1. From any Main page, press Menu twice.
2. Highlight Trk > Active.
3. Select Record Mode.
Off—does not record a track log.
Fill—record a track log until the track memory is full.
Wrap—continuously records a track log, replacing the oldest
track data with new data.
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GPS 152H Owner’s Manual 9
Navigation
Saving a Track
1. From any Main page, press Menu twice.
2. Highlight Trk.
3. Press Menu, and select Save.
4. Select the time, the date, or the Entire Log you want to save.
Optionally, you can edit the name of the track.
Navigating a Saved Track
1. Press NAV/MOB.
2. Select Follow Track.
3. Select the track you want to take.
4. Select Original to follow the track as it was originally recorded,
or select Reverse to follow the track in the opposite direction.
Deleting a Saved Track
1. From any Main page, press Menu twice.
2. Highlight Trk > Saved.
3. Highlight the track you want to delete, and press Menu.
4. Select Delete Track.
Deleting All Saved Tracks
1. From any Main page, press Menu twice.
2. Highlight Trk > Saved.
3. Press Menu.
4. Select Delete All.
Clearing the Active Track
1. From any Main page, press Menu twice.
2. Highlight Trk.
3. Press Menu.
4. Select Clear > OK.

10 GPS 152H Owner’s Manual
Settings
Settings
You can customize a Main page by pressing Menu while on the
page.
You can access the Settings menu from any Main page by pressing
Menu twice.
Customizing the Main Pages
The following table indicates the options that can be viewed by
pressing Menu from each of the ve Main pages:
Map
Page
Compass
Page
Highway
Page
Active
Route Page
Numbers
Page
Add
Waypoint
X
Big Numbers X X X X
Change Data
Fields
X X X X
Congure
Map
X
Create on
Map
X
Edit on Map X
Full Screen
Map
X
Map
Page
Compass
Page
Highway
Page
Active
Route Page
Numbers
Page
Hide Tracks X
Invert X
Loran TD X
Measure
Distance
X
Plan Route X
Re-evaluate X
Remove
Waypoint
X
Stop
Simulator
X
Big Numbers—increases the size of the data elds but reduces the
number of data elds.
Change Data Fields—allows you to select different data elds to be
displayed on the main pages. Data elds selected for one Main page
are displayed on all Main pages (except the Active Route page).
To change data elds:
1. From any Main page (except the Active Route page), press
Menu.
2. Select Change Data Fields. One of the eld names is
highlighted.

GPS 152H Owner’s Manual 11
Settings
3. Select a data eld to change.
4. Select the new eld you want shown.
Full Screen Map On (or Off)—hides or shows the data elds
from all main pages (except the Active Route page).
Loran TD On (or Off)—allows you to convert GPS
coordinates to Loran (Long Range Navigation) TDs. This
system is no longer a primary source of maritime navigation
and should not normally be used. Refer to the U.S. Coast
Guard site at www.navcen.uscg.gov/loran/default.htm for
additional information.
Congure Map—takes you to the Map tab (see page 13) of
the Settings menu.
Measure Distance—allows you to measure the distance and
bearing between two points on the Map Page.
To measure the distance and bearing between two points:
1. From the Map page, press Menu and select Measure Distance.
2. Use the Rocker to move the pointer (indicated by “ENT REF”) to
the point you want to measure from, and press Enter.
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3. Move the pointer to the point to which you want to measure. The
bearing, the distance, and the grid coordinates are displayed
along the top of the screen.
Start Simulator—turns the GPS receiver off for use indoors or for
practice using the chartplotter (page 23).
Hide Tracks—shows or hides tracks (page 8) on the Highway page.
Create on Map—creates a route as described on page 7. This option
is available only when you are not currently navigating a route.
Invert—reverses a route (page 8).
Plan Route—allows you to enter the boat speed, the fuel ow and
the departure time and date when planning a route.
Re-evaluate—recalculates and reactivates the current route data.
Using the Settings Menu
The Settings menu can be viewed from any of the Main pages by
pressing Menu twice.
Using the Waypoints Tab
From any Main page, press Menu twice and highlight Wpt.
See page 3 for more information concerning creating and editing
waypoints and proximity alarms.

12 GPS 152H Owner’s Manual
Settings
Using the Routes Tab
From any Main page, press Menu twice and highlight Rte.
See page 6 for more information concerning creating, editing, and
deleting routes.
Using the Tracks Tab
From any Main page, press Menu twice and highlight Trk.
See page 8 for more information concerning showing, saving, and
deleting tracks.
Record Interval denes the frequency at which the track plot is
recorded. Recording plots more frequently is more accurate but lls
the track log faster.
To set the active track interval:
1. From any Main page, press Menu twice and highlight Trk.
2. Highlight Active, and select Interval.
Distance—records the track based on a distance between
points, as dened by the Value eld.
Time—records the track based on a time interval, as dened
by the Value eld.
Resolution—records the track based on a variance from your
course. This setting is recommended for the most-efcient use
of memory. The value eld denes the maximum error allowed
from the true course before recording a track point.
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Using the Trip Tab
To view trip information from any Main page, press Menu twice
and highlight Trip. Press Menu to reset the trip, the odometer,
the maximum speed, or all elds to zero.
Resetting trip data resets all elds to zero except the Maximum
Speed eld and the Odometer eld.
Using the Time Tab
The Time tab allows you to set the time options.
To set time settings from any Main page, press Menu twice and
highlight Time.
Time Format—select 12-hour or 24-hour time format.
Time Zone—set the time zone you want displayed for time
readings.
Daylight Savings Time—select Off, On, or Auto. The auto
setting automatically turns daylight saving time on or off,
depending on the time of year.
Current Time and Date—manually set the time and date.
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GPS 152H Owner’s Manual 13
Settings
Using the Page Tab
The Page tab allows you to select or deselect the main pages. A
check mark indicates that the page will be displayed when you press
Page.
From any Main page, press Menu twice and highlight Page.
To select a preset page combination, press Menu.
Enable All Pages—selects all pages.
Basic Trackplotter—selects the Map page only.
Nav Tools Only—selects the Compass, Highway, and Active
Route pages only.
Press Jump To to display the selected page.
Using the Map Tab
The Map tab allows you to select preferences one the map including
map detail, map orientation and font size.
From any Main page, press Menu twice and highlight Map.
From any of the subheadings within the Map tab, select Show
Map to view the Map page while you are conguring the map.
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To restore map defaults:
1. From any Main page, press Menu twice and highlight Map.
2. Press Menu.
Restore Defaults—restores the currently selected map
setting to factory default.
Restore All Map Defaults—restores all map settings to
factory default.
Map Tab > General Subheading
Detail—adjusts the amount of detail shown on the map at
different zoom levels.
Orientation—changes the perspective of the map display.
North Up—sets the top of the map display to a north
heading.
Track Up—sets the map display to the current track heading.
Course Up—sets the map so the direction of navigation is
always up. The heading line appears vertically on the screen
if shown.
Auto Zoom—automatically adjusts the map scale to a lower
scale as you approach your destination.
Map Tab > Source Subheading
Not applicable to this unit.
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14 GPS 152H Owner’s Manual
Settings
Map Tab > Points Subheading
Text—sets the screen size of the name of the waypoint, the active
route, the marine navaid, or the geo point on the Map page and
the Highway page.
Zoom—sets the maximum scale at which the feature should
appear on the Map page.
Map Tab > Other Subheading
Acc. Circle (Accuracy Circle)—represents the approximate
accuracy of the unit. Your location is indicated in the center of
the circle.
Heading Line—draws an extension line from the bow of the
boat in the direction of travel.
Bearing Line—shows the bearing from your current location
to a destination waypoint. Selecting a distance sets the scale at
which the bearing line will appear on the screen.
Course Line—shows a navigation line from the point where
navigation was initiated to a destination waypoint. Selecting a
distance sets the scale at which the course line will appear on the
screen.
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Using the Systems Tab
From any Main page, press Menu twice and highlight Page.
Beeper—selects when the unit makes audible sounds.
Speed Filter—averages the speed readings of your boat over
a period of time for smoother speed values. You can select
Auto, or select On to specify the number of seconds you want
the lter to average.
Language—selects the system language.
System Mode—allows you to select simulator mode
(page 23) or normal mode.
Using the Units Tab
The Units tab allows you set units of measure for various values, the
map datum, and the heading reference.
From any Main page, press Menu twice and highlight Units.
Position Format—changes the coordinate style in which a given
location reading appears. Do not change the position format
unless you are using a map or chart that species a different
position format.
Map Datum—changes the coordinate system in which the map
is structured. Do not change the map datum unless you are using
a map or chart that species a different map datum.
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GPS 152H Owner’s Manual 15
Settings
Heading—selects the reference used in calculating heading
information.
Auto Mag Var—automatically sets the magnetic declination
for your location.
True—sets true north as the heading reference.
Grid—sets grid north as the heading reference (000º).
User Mag Var—allows you to set the magnetic variation
value.
Dst, Spd, & Alt—denes the units of measure for distance,
speed, and altitude in nautical, statute, or metric formats.
Dpth—denes the units of measure for depth.
Temp—denes the units of measure for temperature.
Using the Communications Tab
The Communications tab allows you to set the input/output format
used when connecting your unit to other devices, such as NMEA
0183 devices, a PC, or another GPS 152H.
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•
From any Main page, press Menu twice and highlight Com.
Garmin Data Transfer—supports the input or output of
Garmin-proprietary data for communicating with Garmin
software such as MapSource®. There are eleven Transfer
Modes to choose from: Host, Request Almanac, Request
Proximity, Request Routes, Request Tracks, Request
Waypoints, Send Almanac, Send Proximity, Send Routes,
Send Tracks, and Send Waypoints.
Other DGPS (differential GPS)—(input only) provides
interfacing capabilities for 3rd party DGPS receivers.
RTCM In/NMEA Out—allows DGPS input using a standard
RTCM format, and also provides NMEA 0183 version 2.3
output.
NMEA In/NMEA Out—supports the input and output of
standard NMEA 0183 data, and provides sonar NMEA input
support for the DPT, MTW, and VHW sentences (when
connected to a sonar transducer).
None—provides no interfacing capabilities.
Garmin DGPS—used to connect the GPS 152H with a
Garmin DGPS beacon receiver.
When Garmin DGPS is selected, additional elds are provided to
control a differential beacon receiver directly from your GPS 152H.
You can set the unit to automatically scan for the DGPS beacon
signal or you can enter the beacon frequency and bit rate.
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16 GPS 152H Owner’s Manual
Settings
To automatically scan for a frequency:
1. Select Garmin DGPS in the Serial Data Format eld.
2. Select Scan in the Beacon eld. The unit begins scanning.
If it is necessary to restart the scan, press Menu and select
Restart Scan.
To manually enter the frequency and bit rate:
1. Select Garmin DGPS in the Serial Data Format eld.
2. Select User in the Beacon eld.
3. Enter the desired frequency and bit rate. The Status eld
indicates one of the following:
Tuning—attempting to tune to the specied frequency and bit
rate.
Scanning—automatically scanning through the frequencies
and bit rates.
Receiving—receiving DGPS signal and ready for operation.
Check Wiring—not making a connection with a DGPS
receiver.
When the unit is receiving a DGPS signal, the SNR (Signal to
Noise Ratio) and Distance elds contain data. The SNR range
is 0dB to 30dB, with 30dB being the best. The Distance eld
may or may not show data, depending upon the signal being
broadcast from the DGPS site.
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Using the Alarms Tab
You can set the unit to sound an audible alarm when certain
conditions are met. By default, all alarms are turned off except the
arrival alarm.
From any Main page, press Menu twice and highlight Alrm.
Anchor Drag—sets an alarm to sound when you exceed a
specied drift distance.
Arrival—sets an alarm to sound when you are within a
specied distance or time from a destination waypoint. Select
Dist (distance) or Time to set whether the arrival alarm
triggers on distance to arrival or time to arrival.
Off Course—sets an alarm to sound when you are off course
by a specied distance.
Clock—sets an alarm using the system (GPS) clock. The unit
must be on for the clock alarm to work.
Shallow Wtr—sets an alarm to sound when the depth is less
than the specied value.
Deep Water—sets an alarm to sound when the depth is
greater than the specied value.
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