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Setting Up Jumpmaster on Your Foretrex
The Foretrex® 401, 601, 701, 801, and 901 outdoor navigators include a Jumpmaster feature designed for experienced skydivers, particularly those in the military. It provides detailed information for speed of descent and altitude.
Jump Types
Jumpmaster allows users to set one of three types of jumps:
High Altitude-High Opening (HAHO)
High Altitude-Low Opening (HALO)
Static Jumps
Preparing for a Jump With the Jumpmaster Activity
Settings can be customized for each jump including the Desired Impact Point (DIP) and wind set up. As the altitude information is based on the Barometric Altimeter, calibrated before using Jumpmaster. Altitude data will update once per a second.
The jumpmaster feature follows military guidelines for calculating the high altitude release point (HARP). The device detects automatically when you have jumped to begin navigating toward the desired impact point (DIP) using the barometer and electronic compass.
Planning a Jump
Press PAGE until you reach the menu page.
Select JUMPMASTER.
Select a jump type.
Follow the prompts to enter the jump information. The device calculates the HARP.
Select GO TO HARP to start navigation to the HARP.
Descriptions of Jump Types
The jumpmaster feature allows you to set the jump type to one of three types: HAHO, HALO, or Static. The jump type selected determines what additional setup information is required. For all jump types, drop altitudes and opening altitudes are measured in feet above ground level (AGL).
HAHO - High Altitude-High Opening. The jumpmaster jumps from a very high altitude and opens the parachute at a high altitude. You must set a DIP and a drop altitude of at least 1,000 feet. The drop altitude is assumed to be the same as the opening altitude. Common values for a drop altitude range from 12,000 to 24,000 feet AGL.
HALO - High Altitude-Low Opening. The jumpmaster jumps from a very high altitude and opens the parachute at a low altitude. The required information is the same as the HAHO jump type, plus an opening altitude. The opening altitude must not be greater than the drop altitude. Common values for an opening altitude range from 2,000 to 6,000 feet AGL.
STATIC - The wind speed and direction are assumed to be constant for the duration of the jump. The drop altitude must be at least 1,000 feet.
Entering Jump Information
Press PAGE until you reach the menu page.
Select JUMPMASTER.
Select a jump type.
Complete one or more actions to enter your jump information:
For HALO jumps, select OPEN ALTITUDE when prompted to set the open altitude AGL (in feet) when the jumpmaster opens the parachute.
Select DESIRED IMPACT POINT to set a waypoint for the desired landing location.
Select DROP ALTITUDE to set the drop altitude AGL (in feet) when the jumpmaster exits the aircraft.
Select FORWARD THROW to set the horizontal distance traveled (in meters) due to aircraft speed.
Select COURSE TO HARP to set the direction traveled (in degrees) due to aircraft speed.
Select NEXT.
Select WIND to set the wind speed (in knots) and direction (in degrees).
Select CONSTANT to fine-tune some information for the planned jump. Depending on the jump type, you can select PERCENT MAX (%), SAFTEY FACTOR (KFT), K-OPEN, K-FREEFALL, or K-STATIC and enter additional information.
Select AUTO TO DIP to enable navigation to the DIP automatically after you jump.
Select GO TO HARP to start navigation to the HARP.
Entering Wind Information for HAHO and HALO Jumps
Press PAGE until you reach the menu page.
Select JUMPMASTER.
Select a jump type.
Follow the prompts to enter the jump information, then select NEXT.
Select WIND.
Select an altitude.
Enter a wind speed in knots and select OK.
Enter a wind direction in degrees and select OK.
Select DONE. NOTE: The wind value is added to the list. Only wind values included in the list are used in calculations.
Repeat steps 6–9 for each available altitude.
Entering Wind Information for a Static Jump
Press PAGE until you reach the menu page.
Select JUMPMASTER.
Select STATIC.
Follow the prompts to enter the jump information, then select NEXT.
Select WIND.
Select WIND SPEED.
Enter a wind speed in knots and select OK.
Select WIND DIRECTION.
Enter a wind direction in degrees and select OK.
Select DONE.
Constant Settings
Press PAGE until you reach the menu page.
Select JUMPMASTER.
Select a jump type.
Follow the prompts to enter the jump information, then select NEXT.
Select CONSTANT:
PERCENT MAX (%) - Sets the jump range for all jump types. A setting less than 100% decreases the drift distance to the DIP, and a setting greater than 100% increases the drift distance. More experienced jumpmasters may want to use smaller numbers, and less experienced skydivers may want to use larger numbers.
SAFTEY FACTOR (KFT) - Sets the margin of error for a jump (HAHO only). Safety factors are usually integer values of two or greater, and are determined by the jumpmaster based on specifications for the jump.
K-FREEFALL - Sets the wind drag value for a parachute during freefall, based on the parachute canopy rating (HALO only). Each parachute should be labeled with a K value.
K-OPEN - Sets the wind drag value for an open parachute, based on the parachute canopy rating (HAHO and HALO). Each parachute should be labeled with a K value.
K-STATIC - Sets the wind drag value for a parachute during a static jump, based on the parachute canopy rating (Static only). Each parachute should be labeled with a K value.